diff --git a/server/src/com/cloud/vm/UserVmManagerImpl.java b/server/src/com/cloud/vm/UserVmManagerImpl.java
index f58a451cc18..c1d0fc08323 100755
--- a/server/src/com/cloud/vm/UserVmManagerImpl.java
+++ b/server/src/com/cloud/vm/UserVmManagerImpl.java
@@ -2520,19 +2520,19 @@ public class UserVmManagerImpl extends ManagerBase implements UserVmManager, Vir
         if (tmp != null) {
             size = tmp;
         }
-        DiskOfferingVO diskOffering = _diskOfferingDao.findById(diskOfferingId);
-        if (diskOffering.isCustomized()) {
-            if (diskSize == null) {
-                throw new InvalidParameterValueException("This disk offering requires a custom size specified");
-            }
-            Long customDiskOfferingMaxSize = volumeMgr.CustomDiskOfferingMaxSize.value();
-            Long customDiskOfferingMinSize = volumeMgr.CustomDiskOfferingMinSize.value();
-            if ((diskSize < customDiskOfferingMinSize) || (diskSize > customDiskOfferingMaxSize)) {
-                throw new InvalidParameterValueException("VM Creation failed. Volume size: " + diskSize + "GB is out of allowed range. Max: " + customDiskOfferingMaxSize + " Min:" +
-                        customDiskOfferingMinSize);
-            }
-        }
         if (diskOfferingId != null) {
+            DiskOfferingVO diskOffering = _diskOfferingDao.findById(diskOfferingId);
+            if (diskOffering != null && diskOffering.isCustomized()) {
+                if (diskSize == null) {
+                    throw new InvalidParameterValueException("This disk offering requires a custom size specified");
+                }
+                Long customDiskOfferingMaxSize = volumeMgr.CustomDiskOfferingMaxSize.value();
+                Long customDiskOfferingMinSize = volumeMgr.CustomDiskOfferingMinSize.value();
+                if ((diskSize < customDiskOfferingMinSize) || (diskSize > customDiskOfferingMaxSize)) {
+                    throw new InvalidParameterValueException("VM Creation failed. Volume size: " + diskSize + "GB is out of allowed range. Max: " + customDiskOfferingMaxSize + " Min:" +
+                            customDiskOfferingMinSize);
+                }
+            }
             size += _diskOfferingDao.findById(diskOfferingId).getDiskSize();
         }
         resourceLimitCheck(owner, new Long(offering.getCpu()), new Long(offering.getRamSize()));