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-rw-r--r--src/userfunc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/userfunc.c b/src/userfunc.c
index 018542681..522112607 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -109,7 +109,7 @@ one_function_arg(
return arg;
}
is_underscore = arg_copy[0] == '_' && arg_copy[1] == NUL;
- if (argtypes != NULL && !is_underscore)
+ if (argtypes == NULL || !is_underscore)
// Check for duplicate argument name.
for (i = 0; i < newargs->ga_len; ++i)
if (STRCMP(((char_u **)(newargs->ga_data))[i], arg_copy) == 0)