prevent crash in crop_image function

data/ch-s.mse-locale/locale

@@ -1067,9 +1067,13 @@ error:
 	coordinates for blending overlap:	坐标混合重叠
 	images used for blending must have the same size:	边框用图像必须使用相同大小
 	#TODO: Localize
-	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
+	negative image width:				Image with zero or negative width created in function '%s'
+	#TODO: Localize
+	negative image height:				Image with zero or negative height created in function '%s'
 
 	# error from files
+	#TODO: Localize
+	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
 	no game specified:					没有为 %s 指定游戏类型
 	no stylesheet specified for the set:	没有为套牌制定样式表
 	stylesheet and set refer to different game:

data/ch-t.mse-locale/locale

@@ -1065,9 +1065,13 @@ error:
 	coordinates for blending overlap:	坐標混合重疊
 	images used for blending must have the same size:	邊框用圖像必須使用相同大小
 	#TODO: Localize
-	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
+	negative image width:				Image with zero or negative width created in function '%s'
+	#TODO: Localize
+	negative image height:				Image with zero or negative height created in function '%s'
 
 	# error from files
+	#TODO: Localize
+	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
 	no game specified:					沒有為 %s 指定游戲類型
 	no stylesheet specified for the set:	沒有為套牌制定樣式表
 	stylesheet and set refer to different game:

data/da.mse-locale/locale

@@ -1092,10 +1092,13 @@ error:
 	#TODO: Localize
 	images used for blending must have the same size:	Images used for blending must have the same size
 	#TODO: Localize
-	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
+	negative image width:				Image with zero or negative width created in function '%s'
+	#TODO: Localize
+	negative image height:				Image with zero or negative height created in function '%s'
 
 	# error from files
 	#TODO: Localize Section
+	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
 	no game specified:					No game specified for the %s
 	no stylesheet specified for the set:	No stylesheet specified for the set
 	stylesheet and set refer to different game:

data/de.mse-locale/locale

@@ -1007,9 +1007,11 @@ error:
 	# image stuff
 	coordinates for blending overlap:	Koordinaten zum Blenden überlappen sich
 	images used for blending must have the same size:	Bilder müssen zum Mischen die selbe Größe haben.
-	no card fields:						Das Spiel '%s' hat keine Kartenfelder. Definieren Sie mindestens ein Kartenfeld.
+	negative image width:				Bild mit Breite Null oder negativer Breite, erstellt in der Funktion '%s'
+	negative image height:				Bild mit Höhe Null oder negativer Höhe, erstellt in der Funktion '%s'
 
 	# error from files
+	no card fields:						Das Spiel '%s' hat keine Kartenfelder. Definieren Sie mindestens ein Kartenfeld.
 	no game specified:					Kein Spiel für %s gewählt
 	no stylesheet specified for the set:	Kein Stylesheet für diese Edition gewählt
 	stylesheet and set refer to different game:

data/en.mse-locale/locale

@@ -1009,6 +1009,8 @@ error:
 	# image stuff
 	coordinates for blending overlap:	Coordinates for blending overlap
 	images used for blending must have the same size:	Images used for blending must have the same size
+	negative image width:				Image with zero or negative width created in function '%s'
+	negative image height:				Image with zero or negative height created in function '%s'
 
 	# error from files
 	no card fields:						Game '%s' does not have any card fields. Define at least one card field.

data/es.mse-locale/locale

@@ -1068,9 +1068,13 @@ error:
 	coordinates for blending overlap:	Coordenadas para la mezcla (blending) solapada
 	images used for blending must have the same size:	Las imagenes utilizadas para la mezcla (blending) deben tener el mismo tamaño
 	#TODO: Localize
-	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
+	negative image width:				Image with zero or negative width created in function '%s'
+	#TODO: Localize
+	negative image height:				Image with zero or negative height created in function '%s'
 
 	# error from files
+	#TODO: Localize
+	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
 	no game specified:					Ningún juego especificado para el %s
 	no stylesheet specified for the set:	Ho hay hojas de estilo (stylesheet) especificadas para el Set
 	stylesheet and set refer to different game:

data/fr.mse-locale/locale

@@ -1008,9 +1008,11 @@ error:
 	# image stuff
 	coordinates for blending overlap:	Coordonnées pour la superposition du mélange
 	images used for blending must have the same size:	Les images utilisées pour le mélange doivent avoir la même taille
-	no card fields:						Le jeu '%s' ne contient aucun champ de carte. Définissez au moins un champ de carte.
+	negative image width:				Image de largeur nulle ou négative créée par la fonction '%s'
+	negative image height:				Image de hauteur nulle ou négative créée par la fonction '%s'
 
 	# error from files
+	no card fields:						Le jeu '%s' ne contient aucun champ de carte. Définissez au moins un champ de carte.
 	no game specified:					Pas de jeu spécifié pour le %s
 	no stylesheet specified for the set:	Pas de Style spécifié pour le Set
 	stylesheet and set refer to different game:

data/it.mse-locale/locale

@@ -1008,9 +1008,11 @@ error:
 	# image stuff
 	coordinates for blending overlap:	Coordinate per sovrapposizione
 	images used for blending must have the same size:	Le immagini sovrapposte devono avere le stesse misure
-	no card fields:						Il gioco '%s' non ha campi carta. Definisci almeno un campo carta.
+	negative image width:				Immagine con larghezza zero o negativa creata nella funzione '%s'
+	negative image height:				Immagine con altezza zero o negativa creata nella funzione '%s'
 
 	# error from files
+	no card fields:						Il gioco '%s' non ha campi carta. Definisci almeno un campo carta.
 	no game specified:					Nessun gioco specificato per il %s
 	no stylesheet specified for the set:	Nessuno stile specificato per il set
 	stylesheet and set refer to different game:

data/jp.mse-locale/locale

@@ -1068,9 +1068,13 @@ error:
 	coordinates for blending overlap:	オーバーラップを混ぜることのための座標
 	images used for blending must have the same size:	混ざることのために使われたイメージは同じサイズを持たなければなりません
 	#TODO: Localize
-	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
+	negative image width:				Image with zero or negative width created in function '%s'
+	#TODO: Localize
+	negative image height:				Image with zero or negative height created in function '%s'
 
 	# error from files
+	#TODO: Localize
+	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
 	no game specified:					のゲームに指定された %s
 	no stylesheet specified for the set:	セットのために指定されたスタイルシートはありません
 	stylesheet and set refer to different game:

data/ko.mse-locale/locale

@@ -1074,9 +1074,13 @@ error:
 	coordinates for blending overlap:	블렌딩 오버랩을 위한 좌표
 	images used for blending must have the same size:	블렌딩에 사용되는 이미지의 크기는 동일해야 합니다.
 	#TODO: Localize
-	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
+	negative image width:				Image with zero or negative width created in function '%s'
+	#TODO: Localize
+	negative image height:				Image with zero or negative height created in function '%s'
 
 	# error from files
+	#TODO: Localize
+	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
 	no game specified:					에 지정된 게임이 없습니다 %s
 	no stylesheet specified for the set:	세트에 지정된 스타일시트가 없습니다
 	stylesheet and set refer to different game:

data/pl.mse-locale/locale

@@ -1124,9 +1124,13 @@ error:
 	coordinates for blending overlap:	Współrzędne scalania (blending) nachodzą na siebie
 	images used for blending must have the same size:	Obrazy użyte do scalania (blending) muszą mieć ten sam rozmiar
 	#TODO: Localize
-	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
+	negative image width:				Image with zero or negative width created in function '%s'
+	#TODO: Localize
+	negative image height:				Image with zero or negative height created in function '%s'
 
 	# error from files
+	#TODO: Localize
+	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
 	no game specified:					Nie podano gry dla %s
 	no stylesheet specified for the set:	Nie podano arkusza stylu dla zestawu
 	stylesheet and set refer to different game:

data/pt-br.mse-locale/locale

@@ -1009,9 +1009,11 @@ error:
 	# image stuff
 	coordinates for blending overlap:	Cordenadas para mistura sobreposição
 	images used for blending must have the same size:	Imagens utilizados para a mistura deve ter o mesmo tamanho
-	no card fields:						O jogo '%s' não possui campos de Card. Defina pelo menos um campo de Card.
+	negative image width:				Imagem com largura zero ou negativa criada na função '%s'
+	negative image height:				Imagem com altura zero ou negativa criada na função '%s'
 
 	# error from files
+	no card fields:						O jogo '%s' não possui campos de Card. Defina pelo menos um campo de Card.
 	no game specified:					Não há jogo especificado para o %s
 	no stylesheet specified for the set:	Não estilo especificado para a Edição
 	stylesheet and set refer to different game:

data/ru.mse-locale/locale

@@ -1120,10 +1120,13 @@ error:
 	#TODO: Localize
 	images used for blending must have the same size:	Images used for blending must have the same size
 	#TODO: Localize
-	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
+	negative image width:				Image with zero or negative width created in function '%s'
+	#TODO: Localize
+	negative image height:				Image with zero or negative height created in function '%s'
 
 	# error from files
 	#TODO: Localize Section
+	no card fields:						Game '%s' does not have any card fields. Define at least one card field.
 	no game specified:					No game specified for the %s
 	no stylesheet specified for the set:	No stylesheet specified for the set
 	stylesheet and set refer to different game:

src/gfx/generated_image.cpp

@@ -460,7 +460,9 @@ Image InsertedImage::generate(const Options& opt) {
   int inserted_x = offset_x < 0 ? 0         : offset_x;
   int inserted_y = offset_y < 0 ? 0         : offset_y;
   int width =  max(base_x + base_img.GetWidth(),  inserted_x + inserted_img.GetWidth());
-  int height = max(base_y + base_img.GetHeight(), inserted_y + inserted_img.GetHeight());
+  int height = max(base_y + base_img.GetHeight(), inserted_y + inserted_img.GetHeight());
+  if (width <= 0) throw ScriptError(_ERROR_1_("negative image width", "insert_image"));
+  if (height <= 0) throw ScriptError(_ERROR_1_("negative image height", "insert_image"));
   UInt size = width * height;
   Image img = wxImage(width, height, false);
   img.InitAlpha();
@@ -496,7 +498,9 @@ bool InsertedImage::operator == (const GeneratedImage& that) const {
 
 // ----------------------------------------------------------------------------- : CropImage
 
-Image CropImage::generate(const Options& opt) {
+Image CropImage::generate(const Options& opt) {
+  if (width <= 0) throw ScriptError(_ERROR_1_("negative image width", "crop_image"));
+  if (height <= 0) throw ScriptError(_ERROR_1_("negative image height", "crop_image"));
   UInt size = width * height;
   Image img = wxImage(width, height, false);
   img.InitAlpha();