diff --git a/src/Peachpie.Library.MySql/MySqli/mysqli.cs b/src/Peachpie.Library.MySql/MySqli/mysqli.cs
index 4adad1640b..5dd2ef27b6 100644
--- a/src/Peachpie.Library.MySql/MySqli/mysqli.cs
+++ b/src/Peachpie.Library.MySql/MySqli/mysqli.cs
@@ -88,7 +88,7 @@ internal mysqli(Context ctx, IDbConnection dbconnection)
         /// <summary>
         /// Returns the number of columns for the most recent query.
         /// </summary>
-        public int field_count => Connection.LastResult.FieldCount;
+        public int field_count => Connection.LastResult?.FieldCount ?? 0;
 
         /// <summary>
         /// Get MySQL client info.