diff --git a/clients/java-client-lib/client-core/src/main/java/net/zscript/javaclient/nodes/ZscriptBasicNode.java b/clients/java-client-lib/client-core/src/main/java/net/zscript/javaclient/nodes/ZscriptBasicNode.java
index ec3c76688..0fceb3f73 100644
--- a/clients/java-client-lib/client-core/src/main/java/net/zscript/javaclient/nodes/ZscriptBasicNode.java
+++ b/clients/java-client-lib/client-core/src/main/java/net/zscript/javaclient/nodes/ZscriptBasicNode.java
@@ -61,7 +61,7 @@ class ZscriptBasicNode implements ZscriptNode {
             try {
                 if (r.hasAddress()) {
                     if (!addressingSystem.response(r)) {
-                        callbackPool.sendCallback(unknownResponseHandler, r);
+                        callbackPool.sendCallback(unknownResponseHandler, r, callbackExceptionHandler);
                     }
                 } else {
                     response(r);
@@ -110,12 +110,11 @@ public void send(AddressedCommand addr) {
     public void checkTimeouts() {
         Collection<CommandSequence> timedOut = connectionBuffer.checkTimeouts();
         if (!timedOut.isEmpty()) {
-            long nanoTime = System.nanoTime();
             for (CommandSequence seq : timedOut) {
                 if (fullSequenceCallbacks.get(seq) != null) {
-                    callbackPool.sendCallback(fullSequenceCallbacks.get(seq), ResponseSequence.blank());
+                    callbackPool.sendCallback(fullSequenceCallbacks.get(seq), ResponseSequence.blank(), callbackExceptionHandler);
                 } else if (pathCallbacks.get(seq.getExecutionPath()) != null) {
-                    callbackPool.sendCallback(pathCallbacks.get(seq.getExecutionPath()), ResponseExecutionPath.blank());
+                    callbackPool.sendCallback(pathCallbacks.get(seq.getExecutionPath()), ResponseExecutionPath.blank(), callbackExceptionHandler);
                 }
             }
         }
@@ -125,9 +124,9 @@ private void response(AddressedResponse resp) {
         if (resp.getContent().getResponseValue() != 0) {
             Consumer<ResponseSequence> handler = notificationHandlers.get(resp.getContent().getResponseValue());
             if (handler != null) {
-                callbackPool.sendCallback(handler, resp.getContent());
+                callbackPool.sendCallback(handler, resp.getContent(), callbackExceptionHandler);
             } else {
-                callbackPool.sendCallback(unknownResponseHandler, resp);
+                callbackPool.sendCallback(unknownResponseHandler, resp, callbackExceptionHandler);
             }
             return;
         }
@@ -137,20 +136,20 @@ private void response(AddressedResponse resp) {
             if (resp.getContent().hasEchoValue() && echoSystem.unmatchedReceive(resp.getContent().getEchoValue())) {
                 return;
             }
-            callbackPool.sendCallback(unknownResponseHandler, resp);
+            callbackPool.sendCallback(unknownResponseHandler, resp, callbackExceptionHandler);
             return;
         }
         strategy.mayHaveSpace();
         parentConnection.responseReceived(found);
         Consumer<ResponseSequence> seqCallback = fullSequenceCallbacks.remove(found.getContent());
         if (seqCallback != null) {
-            callbackPool.sendCallback(seqCallback, resp.getContent());
+            callbackPool.sendCallback(seqCallback, resp.getContent(), callbackExceptionHandler);
         } else {
             Consumer<ResponseExecutionPath> pathCallback = pathCallbacks.remove(found.getContent().getExecutionPath());
             if (pathCallback != null) {
-                callbackPool.sendCallback(pathCallback, resp.getContent().getExecutionPath());
+                callbackPool.sendCallback(pathCallback, resp.getContent().getExecutionPath(), callbackExceptionHandler);
             } else {
-                callbackPool.sendCallback(unknownResponseHandler, resp);
+                callbackPool.sendCallback(unknownResponseHandler, resp, callbackExceptionHandler);
             }
         }
     }
diff --git a/clients/java-client-lib/client-core/src/main/java/net/zscript/javaclient/threading/ZscriptCallbackThreadpool.java b/clients/java-client-lib/client-core/src/main/java/net/zscript/javaclient/threading/ZscriptCallbackThreadpool.java
index 64fa799d3..4d137fd60 100644
--- a/clients/java-client-lib/client-core/src/main/java/net/zscript/javaclient/threading/ZscriptCallbackThreadpool.java
+++ b/clients/java-client-lib/client-core/src/main/java/net/zscript/javaclient/threading/ZscriptCallbackThreadpool.java
@@ -15,11 +15,27 @@ public ZscriptCallbackThreadpool(ExecutorService callbackPool) {
         this.callbackPool = callbackPool;
     }
 
-    public <T> void sendCallback(Consumer<T> callback, T content) {
+    public <T> void sendCallback(Consumer<T> callback, T content, Consumer<Exception> handler) {
+        callbackPool.submit(() -> {
+            try {
+                callback.accept(content);
+            } catch (Exception e) {
+                handler.accept(e);
+            }
+        });
+    }
+
+    public <T extends Exception> void sendCallback(Consumer<T> callback, T content) {
         callbackPool.submit(() -> callback.accept(content));
     }
 
-    public void sendCallback(Runnable callback) {
-        callbackPool.submit(callback);
+    public void sendCallback(Runnable callback, Consumer<Exception> handler) {
+        callbackPool.submit(() -> {
+            try {
+                callback.run();
+            } catch (Exception e) {
+                handler.accept(e);
+            }
+        });
     }
 }