Index: linux-2.6/fs/ext4/resize.c
===================================================================
--- linux-2.6.orig/fs/ext4/resize.c
+++ linux-2.6/fs/ext4/resize.c
@@ -930,7 +930,8 @@ int ext4_group_add(struct super_block *s
     percpu_counter_add(&sbi->s_freeinodes_counter,
                EXT4_INODES_PER_GROUP(sb));

-    if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) {
+    if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG) &&
+        sbi->s_log_groups_per_flex) {
         ext4_group_t flex_group;
         flex_group = ext4_flex_group(sbi, input->group);
         atomic_add(input->free_blocks_count,