diff --git a/src/main/java/org/qortal/controller/AtStatesTrimmer.java b/src/main/java/org/qortal/controller/AtStatesTrimmer.java
index 5b663865..f141abd7 100644
--- a/src/main/java/org/qortal/controller/AtStatesTrimmer.java
+++ b/src/main/java/org/qortal/controller/AtStatesTrimmer.java
@@ -30,6 +30,10 @@ public class AtStatesTrimmer implements Runnable {
 				if (chainTip == null || NTP.getTime() == null)
 					continue;
 
+				// Don't even attempt if we're mid-sync as our repository requests will be delayed for ages
+				if (Controller.getInstance().isSynchronizing())
+					continue;
+
 				long currentTrimmableTimestamp = NTP.getTime() - Settings.getInstance().getAtStatesMaxLifetime();
 				// We want to keep AT states near the tip of our copy of blockchain so we can process/orphan nearby blocks
 				long chainTrimmableTimestamp = chainTip.getTimestamp() - Settings.getInstance().getAtStatesMaxLifetime();
diff --git a/src/main/java/org/qortal/controller/OnlineAccountsSignaturesTrimmer.java b/src/main/java/org/qortal/controller/OnlineAccountsSignaturesTrimmer.java
index cca8d611..e9b846fc 100644
--- a/src/main/java/org/qortal/controller/OnlineAccountsSignaturesTrimmer.java
+++ b/src/main/java/org/qortal/controller/OnlineAccountsSignaturesTrimmer.java
@@ -32,6 +32,10 @@ public class OnlineAccountsSignaturesTrimmer implements Runnable {
 				if (chainTip == null || NTP.getTime() == null)
 					continue;
 
+				// Don't even attempt if we're mid-sync as our repository requests will be delayed for ages
+				if (Controller.getInstance().isSynchronizing())
+					continue;
+
 				// Trim blockchain by removing 'old' online accounts signatures
 				long upperTrimmableTimestamp = NTP.getTime() - BlockChain.getInstance().getOnlineAccountSignaturesMaxLifetime();
 				int upperTrimmableHeight = repository.getBlockRepository().getHeightFromTimestamp(upperTrimmableTimestamp);