Could this bluescreen of death from my audio driver be caused by my keyboard filter driver?

After installing a custom keyboard filter driver (kbfiltr.sys), a slightly modified version of kbfiltr (Windows-driver-samples), and waking my system from standby the next morning, I was greeted by this BSOD:

Bug Check String  DRIVER_IRQL_NOT_LESS_OR_EQUAL 
Bug Check Code    0x000000d1    
Parameter 1       00000000`00000000 
Parameter 2       00000000`00000002 
Parameter 3       00000000`00000000 
Parameter 4       fffff801`7675cd91 
Caused By Driver  cmudaxp.sys   
Caused By Address cmudaxp.sys+2f7d91    
Crash Address     ntoskrnl.exe+1402a0

Edit: Here are all drivers found in stack by BlueScreenView

Filename      Address in Stack
cmudaxp.sys   cmudaxp.sys+2f7d91    
ntoskrnl.exe  ntoskrnl.exe+1e448b                           

This BSOD seems to be a well known Asus Xonar audio driver bug, but it

• never occured to me before during the whole 5 years of running my current setup
• just happened the day after installing my new custom driver

Since the BSOD happened, I've woken up my system from standby several times without any errors.

Is this purely a very unfortunate coincidence or is there a chance it might have been caused by my driver (kbfiltr.sys)?

Follow up: During the last 8 days, and without changing the system, I didn't get any more BSODs. It's highly probable that this single BSOD was just a very unlucky coincidence.