diff --git a/src/OpIDSum.jl b/src/OpIDSum.jl
index ae003e6..0abdcac 100644
--- a/src/OpIDSum.jl
+++ b/src/OpIDSum.jl
@@ -329,8 +329,7 @@ end
       end
     end
 
-    flux != QN() && error("The term does not have zero flux: $ops")
-    mod(fermion_parity, 2) != 0 && error("Odd parity fermion terms not supported: $ops")
+    mod(fermion_parity, 2) != 0 && error("Odd parity fermion terms not supported.")
   end
 end