diff --git a/collector/collector.pl b/collector/collector.pl
index 555415940d844a75ca0795b7ec0c49b2f2bd6453..441b8b96e38c0c7e48705148089cd1d4f16d08aa 100755
--- a/collector/collector.pl
+++ b/collector/collector.pl
@@ -165,6 +165,7 @@ sub     getTransByHash
         'eth_getTransactionByHash',
         $hash
     );
+    die "Invalid object received:\n".Dumper($json) if not exists $json->{'number'};
     my  $max                    =   0;
     my  $rcpt                   =   undef;
     do {