diff --git a/jedi/parsing.py b/jedi/parsing.py
index 0b70f612..57a75380 100644
--- a/jedi/parsing.py
+++ b/jedi/parsing.py
@@ -835,7 +835,7 @@ class Param(Statement):
         """ get the name of the param """
         n = self.set_vars or self.used_vars
         if len(n) > 1:
-            raise IndexError("Multiple param names (%s)." % n)
+            debug.warning("Multiple param names (%s)." % n)
         return n[0]
 
 
diff --git a/test/completion/invalid.py b/test/completion/invalid.py
index a49a56c6..0da8a37a 100644
--- a/test/completion/invalid.py
+++ b/test/completion/invalid.py
@@ -1,5 +1,10 @@
-# This file is less about the results and much more about the fact, that no
-# exception should be thrown.
+"""
+This file is less about the results and much more about the fact, that no
+exception should be thrown.
+
+Basically this file could change depending on the current implementation. But
+there should never be any errors.
+"""
 
 #? ['upper']
 str()).upper
@@ -101,3 +106,9 @@ a[0]
 
 #? []
 int()).
+
+def asdf(a or b): # multiple param names
+    return a
+
+#? int()
+asdf(2)