Memory corruption related to signal emission?

[blooglet]

I should probably mention that _streams is a QMap. streamOneSSRC and streamTwoSSRC are uint32_t with values similar to 738621152 and 3435571404. I've asserted that

assert(_streams.find(streamOneSSRC) != _streams.end());
        assert(_streams.find(streamTwoSSRC) != _streams.end());

assert(_streams.find(streamOneSSRC) != _streams.end());
        assert(_streams.find(streamTwoSSRC) != _streams.end());

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right before the signal emission happens.