diff --git a/ReviewBot.py b/ReviewBot.py
index 988a77f6..73b1e756 100644
--- a/ReviewBot.py
+++ b/ReviewBot.py
@@ -154,9 +154,10 @@ class ReviewBot(object):
     def check_action_maintenance_incident(self, req, a):
         dst_package = a.src_package
         # dirty obs crap
-        ugly_suffix = '.'+a.tgt_releaseproject.replace(':', '_')
-        if dst_package.endswith(ugly_suffix):
-            dst_package = dst_package[:-len(ugly_suffix)]
+        if a.tgt_releaseproject is not None:
+            ugly_suffix = '.'+a.tgt_releaseproject.replace(':', '_')
+            if dst_package.endswith(ugly_suffix):
+                dst_package = dst_package[:-len(ugly_suffix)]
         return self.check_source_submission(a.src_project, a.src_package, a.src_rev, a.tgt_releaseproject, dst_package)
 
     def check_action_maintenance_release(self, req, a):