6 Minutes Of Black Screen

So I made a scene in CA and I finished it. The original audio I imported was 6 minutes long, but I cut it down to what I needed and made my scene, but the problem is after it's done (1 minute), in my exported mp4 there is a black screen that plays from the 1 minute mark to the 6 minute mark, the original length of my audio. Even though everything in the timeline is finished after 1 minute, I noticed that the timeline is lit, and once it reaches the 6 minute mark it becomes dark from there on out. Is there anyway for me to fix this inside of CA instead of cropping out the 5 minutes of black screen through the use of iMovie, etc.?