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-rw-r--r--src/sp-object-group.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/sp-object-group.h b/src/sp-object-group.h
index a34ef0721..552b321b1 100644
--- a/src/sp-object-group.h
+++ b/src/sp-object-group.h
@@ -17,7 +17,7 @@
#include "sp-object.h"
#define SP_OBJECTGROUP(obj) ((SPObjectGroup*)obj)
-#define SP_IS_OBJECTGROUP(obj) (dynamic_cast<const SPObjectGroup*>((SPObject*)obj))
+#define SP_IS_OBJECTGROUP(obj) (dynamic_cast<const SPObjectGroup*>((SPObject*)obj) != NULL)
class SPObjectGroup : public SPObject {
public: