fix quota calculation when the the db is empty (#16699)

* fix quota calculation when the the db is empty

* do not compute workers utilization if extented statistics is not enabled

1 files changed, 8 insertions, 0 deletions

diff --git a/database/engine/rrdengine.c b/database/engine/rrdengine.c
index f415fbcade..b82cc1ad18 100644
--- a/database/engine/rrdengine.c
+++ b/database/engine/rrdengine.c
@@ -1398,6 +1398,14 @@ uint64_t rrdeng_target_data_file_size(struct rrdengine_instance *ctx) {
 
 bool rrdeng_ctx_exceeded_disk_quota(struct rrdengine_instance *ctx)
 {
+    if(!ctx->datafiles.first)
+        // no datafiles available
+        return false;
+
+    if(!ctx->datafiles.first->next)
+        // only 1 datafile available
+        return false;
+
     uint64_t estimated_disk_space = ctx_current_disk_space_get(ctx) + rrdeng_target_data_file_size(ctx) -
                                     (ctx->datafiles.first->prev ? ctx->datafiles.first->prev->pos : 0);