diff --git a/Hardware/src/main/java/com/qualcomm/hardware/lynx/LynxModule.java b/Hardware/src/main/java/com/qualcomm/hardware/lynx/LynxModule.java
index f02a92c7..2d1b31ef 100644
--- a/Hardware/src/main/java/com/qualcomm/hardware/lynx/LynxModule.java
+++ b/Hardware/src/main/java/com/qualcomm/hardware/lynx/LynxModule.java
@@ -1368,24 +1368,26 @@ public double getAnalogInputVoltage(int inputZ, VoltageUnit unit)
      */
     public BulkData getBulkData()
         {
-        clearBulkCache();
-
-        LynxGetBulkInputDataCommand command = new LynxGetBulkInputDataCommand(this);
-        try
-            {
-            LynxGetBulkInputDataResponse response = command.sendReceive();
             synchronized (bulkCachingLock)
+            {
+                clearBulkCache();
+
+                LynxGetBulkInputDataCommand command = new LynxGetBulkInputDataCommand(this);
+                try
                 {
-                lastBulkData = new BulkData(response);
-                return lastBulkData;
+                    LynxGetBulkInputDataResponse response = command.sendReceive();
+                    lastBulkData = new BulkData(response);
+                    return lastBulkData;
+                }
+                catch (InterruptedException|RuntimeException|LynxNackException e)
+                {
+                    handleException(e);
                 }
-            }
-        catch (InterruptedException|RuntimeException|LynxNackException e)
-            {
-            handleException(e);
-            }
 
-        return LynxUsbUtil.makePlaceholderValue(new BulkData(new LynxGetBulkInputDataResponse(this)));
+                BulkData placeholder = LynxUsbUtil.makePlaceholderValue(new BulkData(new LynxGetBulkInputDataResponse(this)));
+                lastBulkData = placeholder;
+                return placeholder;
+            }
         }
 
     /**