Without any info about your project, your computer and stuff like your output stoarge we can't realyl tel lyou much. The error happening at the same frame every time strongly suggests that this is a problem with the project rather than being an encoding error per se. Perhaps some source footage is damaged, perhaps an effect kicks in, perhaps there are problems with temp files and the cache. Really impossible to say. At the very least enable more verbose logging on the render queue and have an eye on your task manager/ activity monitor while rendering. This could offer some clues like e.g. CPU usage spiking or disk activity dying down.