 EXC_BAD_ACCESS error on IOS

I'm using custom SSD model (I tried my own and three other models that were trained by users)

They work fine in Android, but in IOS it fails here:

```
if (interpreter->AllocateTensors() != kTfLiteOk) {
    callback(@[@"Failed to allocate tensors!"]);
  }
```

With EXC_BAD_ACCESS

When I use ssd_mobilenet.tflite from model Zoo IOS does not throw error
