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-rw-r--r--engines/gob/video.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/engines/gob/video.cpp b/engines/gob/video.cpp
index 5684a1f443..9e1039f659 100644
--- a/engines/gob/video.cpp
+++ b/engines/gob/video.cpp
@@ -484,6 +484,7 @@ void Video::drawSpriteDouble(SurfaceDesc &source, SurfaceDesc &dest,
void Video::drawLetter(int16 item, int16 x, int16 y, const Font &font,
int16 color1, int16 color2, int16 transp, SurfaceDesc &dest) {
+ assert(item != 0x00);
_videoDriver->drawLetter((unsigned char)item, x, y, font, color1, color2, transp, dest);
}