Also make sure the transactionReceipt contains a blockNumber when checking if a transaction has been mined.

packages/web3-wrapper/CHANGELOG.json

@@ -1,4 +1,13 @@
 [
+    {
+        "version": "2.0.3",
+        "changes": [
+            {
+                "note":
+                    "Fixes issue #1076 where Parity now returns a placeholder transactionReceipt before the transaction is mined."
+            }
+        ]
+    },
     {
         "timestamp": 1536142250,
         "version": "2.0.2",

packages/web3-wrapper/src/web3_wrapper.ts

@@ -539,7 +539,7 @@ export class Web3Wrapper {
         }
         // Immediately check if the transaction has already been mined.
         let transactionReceipt = await this.getTransactionReceiptAsync(txHash);
-        if (!_.isNull(transactionReceipt)) {
+        if (!_.isNull(transactionReceipt) && !_.isNull(transactionReceipt.blockNumber)) {
             const logsWithDecodedArgs = _.map(
                 transactionReceipt.logs,
                 this.abiDecoder.tryToDecodeLogOrNoop.bind(this.abiDecoder),