1 files changed, 1 insertions, 1 deletions

diff --git a/execute.c b/execute.c
index a3766b8..5255052 100644
--- a/execute.c
+++ b/execute.c
@@ -1056,7 +1056,7 @@ static int ih_function_exists(IH_HANDLER_PARAMS)
         }
 
         /* Ignore leading "\" */
-        if (lcname[0] == '\\') {
+        if (func_name_len > 0 && lcname[0] == '\\') {
                 lcname = &lcname[1];
                 func_name_len--;
         }