diff --git a/src/main/java/org/qortal/transaction/ArbitraryTransaction.java b/src/main/java/org/qortal/transaction/ArbitraryTransaction.java
index b2954dd9..df4a92f7 100644
--- a/src/main/java/org/qortal/transaction/ArbitraryTransaction.java
+++ b/src/main/java/org/qortal/transaction/ArbitraryTransaction.java
@@ -369,6 +369,11 @@ public class ArbitraryTransaction extends Transaction {
 		String name = arbitraryTransactionData.getName();
 		String identifier = arbitraryTransactionData.getIdentifier();
 
+		if (service == null) {
+			// Unsupported service - ignore this resource
+			return;
+		}
+
 		// In the cache we store null identifiers as "default", as it is part of the primary key
 		if (identifier == null) {
 			identifier = "default";
@@ -427,6 +432,11 @@ public class ArbitraryTransaction extends Transaction {
 		String name = latestTransactionData.getName();
 		String identifier = latestTransactionData.getIdentifier();
 
+		if (service == null) {
+			// Unsupported service - ignore this resource
+			return;
+		}
+
 		// In the cache we store null identifiers as "default", as it is part of the primary key
 		if (identifier == null) {
 			identifier = "default";