Fixed treating successful mysql queries as error when warnings are generated

lib/FronkDB/FronkDB.php

@@ -7,6 +7,8 @@ class FronkDB {
     private $lastError;
     private $log;
 
+    public $insert_id;
+
     private static $instances = [];
 
     //private static $instance;
@@ -71,6 +73,9 @@ class FronkDB {
     }
 
     public function query($sql, $print_error = false) {
+        // unset last insert id on qvery new query
+        $this->insert_id = null;
+
         if(!$this->link) {
             $this->connect();
         }
@@ -103,6 +108,8 @@ class FronkDB {
                 $this->log->warn("SQL Last Error: ".$this->lastError);
             }
 
+            $this->insert_id = mysqli_insert_id($this->link);
+
             // check for warnings
             if(mysqli_warning_count($this->link) > 0) {
                 $log_query = true;