diff --git a/modules/corelib/util.lua b/modules/corelib/util.lua
index a2ff02b1..0691fc88 100644
--- a/modules/corelib/util.lua
+++ b/modules/corelib/util.lua
@@ -313,7 +313,7 @@ function signalcall(param, ...)
         perror(ret)
       end
     end
-  elseif func ~= nil then
+  elseif param ~= nil then
     error('attempt to call a non function value')
   end
   return false