diff --git a/source/blender/editors/interface/interface.c b/source/blender/editors/interface/interface.c
index 57f3d228a17..9a717d30a81 100644
--- a/source/blender/editors/interface/interface.c
+++ b/source/blender/editors/interface/interface.c
@@ -3913,7 +3913,7 @@ uiBut *uiDefIconTextButO_ptr(uiBlock *block, int type, wmOperatorType *ot, int o
 uiBut *uiDefIconTextButO(uiBlock *block, int type, const char *opname, int opcontext, int icon, const char *str, int x, int y, short width, short height, const char *tip)
 {
 	wmOperatorType *ot = WM_operatortype_find(opname, 0);
-	if (str[0] == '\0') 
+	if (str && str[0] == '\0') 
 		return uiDefIconButO_ptr(block, type, ot, opcontext, icon, x, y, width, height, tip);
 	return uiDefIconTextButO_ptr(block, type, ot, opcontext, icon, str, x, y, width, height, tip);
 }