I agree. Moisture has gotten in there causing the clumps. Not worth the risk. Spread it on the lawn. Smokeless powder is high in nitrogen and good for the grass. Just don't tell your tree hugging neighbor, they will think it is hazardous. Birkenstock wearing, dude smootching, Austinites.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball