diff --git a/git_update.sh b/git_update.sh
index 0357f64..ce1c37d 100755
--- a/git_update.sh
+++ b/git_update.sh
@@ -59,16 +59,17 @@ resolve_configured_php_bin() {
       echo "keyhelp-php-domain"
       return
     fi
-    if command -v keyhelp-php84 >/dev/null 2>&1; then
-      echo "keyhelp-php84"
+    if [[ -x "/usr/bin/keyhelp-php-domain" ]]; then
+      echo "/usr/bin/keyhelp-php-domain"
       return
     fi
-    if command -v php >/dev/null 2>&1; then
-      echo "php"
+    if [[ -x "/usr/local/bin/keyhelp-php-domain" ]]; then
+      echo "/usr/local/bin/keyhelp-php-domain"
       return
     fi
-    echo "$current"
-    return
+    echo "Configured PHP binary 'keyhelp-php-domain' was not found." >&2
+    echo "Set ACP -> System -> CLI to a working custom binary (e.g. keyhelp-php84)." >&2
+    exit 1
   fi
 
   if command -v "$trimmed" >/dev/null 2>&1; then
@@ -81,7 +82,9 @@ resolve_configured_php_bin() {
     return
   fi
 
-  echo "$current"
+  echo "Configured PHP binary '$trimmed' is not executable/resolvable." >&2
+  echo "Set ACP -> System -> CLI to a valid command or absolute executable path." >&2
+  exit 1
 }
 
 read_setting_php_bin() {