diff --git a/applications/external/avr_isp_programmer/helpers/avr_isp.c b/applications/external/avr_isp_programmer/helpers/avr_isp.c
index 51b4f8846..ab7c6f496 100644
--- a/applications/external/avr_isp_programmer/helpers/avr_isp.c
+++ b/applications/external/avr_isp_programmer/helpers/avr_isp.c
@@ -153,6 +153,7 @@ bool avr_isp_auto_set_spi_speed_start_pmode(AvrIsp* instance) {
         }
     }
     if(instance->spi) avr_isp_spi_sw_free(instance->spi);
+    instance->spi = NULL;
     return false;
 }
 
diff --git a/applications/external/avr_isp_programmer/lib/driver/avr_isp_prog.c b/applications/external/avr_isp_programmer/lib/driver/avr_isp_prog.c
index b3c81f3b1..ad6489cf0 100644
--- a/applications/external/avr_isp_programmer/lib/driver/avr_isp_prog.c
+++ b/applications/external/avr_isp_programmer/lib/driver/avr_isp_prog.c
@@ -318,6 +318,7 @@ static bool avr_isp_prog_auto_set_spi_speed_start_pmode(AvrIspProg* instance) {
         }
     }
     if(instance->spi) avr_isp_spi_sw_free(instance->spi);
+    instance->spi = NULL;
     return false;
 }