Check null randomx dataset before calling randomx_dataset_item_count

src/miner.cpp

@@ -1072,14 +1072,14 @@ void static RandomXMiner()
     randomx_dataset *randomxDataset = randomx_alloc_dataset(flags);
     rxdebug("%s: created dataset\n");
 
-    auto datasetItemCount = randomx_dataset_item_count();
-    rxdebug("%s: dataset items=%lu\n", datasetItemCount);
-
     if( randomxDataset == nullptr) {
         LogPrintf("%s: allocating randomx dataset failed!\n", __func__);
         return;
     }
 
+    auto datasetItemCount = randomx_dataset_item_count();
+    rxdebug("%s: dataset items=%lu\n", datasetItemCount);
+
     char randomxHash[RANDOMX_HASH_SIZE];
     rxdebug("%s: created randomxHash of size %d\n", RANDOMX_HASH_SIZE);
     char randomxKey[82]; // randomx spec says keysize of >60 bytes is implementation-specific