Fatal Error: String too long; browser was disconnected

I have been getting a loop of error messages switching between 'R session disconnected, this browser was disconnected from the R session because another browser connected' and 'Fatal error: Unexpected Exception: string too long'. Trying to close them has no effect, the reconnect button has no effect, uninstalling and re-installing has had no effect. R was working normally and this happened mid-session. Any advice would be appreciated please.