diff --git a/usermods/usermod_v2_four_line_display/usermod_v2_four_line_display.h b/usermods/usermod_v2_four_line_display/usermod_v2_four_line_display.h
index 3fcf6612..b4c205aa 100644
--- a/usermods/usermod_v2_four_line_display/usermod_v2_four_line_display.h
+++ b/usermods/usermod_v2_four_line_display/usermod_v2_four_line_display.h
@@ -175,7 +175,9 @@ class FourLineDisplayUsermod : public Usermod {
         if (!pinManager.allocateMultiplePins(pins, 5, po)) { type=NONE; return; }
       } else {
         isHW = (ioPin[0]==i2c_scl && ioPin[1]==i2c_sda);
+        //isHW = true;
         if (isHW) po = PinOwner::HW_I2C;  // allow multiple allocations of HW I2C bus pins
+        if (ioPin[0] < 0 || ioPin[1] < 0)  { type=NONE; return; }  //WLEDSR bugfix - ensure that "final" GPIO are valid
         PinManagerPinType pins[2] = { { ioPin[0], true }, { ioPin[1], true } };
         if (!pinManager.allocateMultiplePins(pins, 2, po)) { type=NONE; return; }
       }
diff --git a/usermods/usermod_v2_four_line_display_ALT/usermod_v2_four_line_display_ALT.h b/usermods/usermod_v2_four_line_display_ALT/usermod_v2_four_line_display_ALT.h
index 7555933f..e599909e 100644
--- a/usermods/usermod_v2_four_line_display_ALT/usermod_v2_four_line_display_ALT.h
+++ b/usermods/usermod_v2_four_line_display_ALT/usermod_v2_four_line_display_ALT.h
@@ -336,8 +336,10 @@ class FourLineDisplayUsermod : public Usermod {
           ioPin[1] = hw_sda;
         }
         isHW = (ioPin[0]==hw_scl && ioPin[1]==hw_sda);
+        // isHW = true;
         if (isHW) po = PinOwner::HW_I2C;  // allow multiple allocations of HW I2C bus pins
         PinManagerPinType pins[2] = { {ioPin[0], true }, { ioPin[1], true } };
+        if (ioPin[0] < 0 || ioPin[1] < 0)  { type=NONE; return; }  //WLEDSR bugfix - ensure that "final" GPIO are valid
         if (!pinManager.allocateMultiplePins(pins, 2, po)) { type=NONE; return; }
       }