In all of the guns I know of, the slide lock is pushed up by the mag follower, when the mag is empty.
If the slide locked back with one in the magazine, then I would have to assume you pushed the lever up inadvertently, or the round may have started to chamber, but got hung up on the ramp, holding the slide back.
I would be inclined to look into the latter, as it may prove to be a problem in the future.
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