startup_stm32f091xb.s or ...xc.s - External interrupt #32 (USB) is missing in startup codes
... DCD USART2_IRQHandler ; USART2 DCD USART3_8_IRQHandler ; USART3, USART4, USART5, USART6, USART7USART8 DCD CEC_CAN_IRQHandler ; CEC and CAN__Vectors_End...