diff --git a/src/match_entry.c b/src/match_entry.c
index 4adc4cf..7c441a0 100644
--- a/src/match_entry.c
+++ b/src/match_entry.c
@@ -27,6 +27,7 @@ match_entry * match_entry_createl(const char * path, int path_len) {
 }
 
 void match_entry_free(match_entry * entry) {
+    assert(entry);
     if (entry->vars) {
         str_array_free(entry->vars);
     }