diff --git a/advanced/Scripts/wildcard_regex_converter.sh b/advanced/Scripts/wildcard_regex_converter.sh
index 7c80d07e..46c5e952 100644
--- a/advanced/Scripts/wildcard_regex_converter.sh
+++ b/advanced/Scripts/wildcard_regex_converter.sh
@@ -24,5 +24,5 @@ convert_wildcard_to_regex() {
   # Remove repeated domains (may have been inserted two times due to A and AAAA blocking)
   uniquedomains="$(uniq <<< "${domains}")"
   # Automatically generate regex filters and remove old wildcards file
-  awk '{print "(^)|(\\.)"$0"$"}' <<< "${uniquedomains}" >> "${regexFile}" && rm "${wildcardFile}"
+  awk '{print "(^)|(\\.)"$0"$"}' <<< "${uniquedomains}" >> "${regexFile:?}" && rm "${wildcardFile}"
 }