diff --git a/porting/lv_port_indev_template.c b/porting/lv_port_indev_template.c
index 54b8c9fda..bf4a6436f 100644
--- a/porting/lv_port_indev_template.c
+++ b/porting/lv_port_indev_template.c
@@ -140,14 +140,14 @@ void lv_port_indev_init(void)
 
     /*Register a encoder input device*/
     lv_indev_drv_init(&indev_drv);
-    indev_drv.type = LV_INDEV_TYPE_KEYPAD;
+    indev_drv.type = LV_INDEV_TYPE_ENCODER;
     indev_drv.read_cb = encoder_read;
     indev_encoder = lv_indev_drv_register(&indev_drv);
 
     /* Later you should create group(s) with `lv_group_t * group = lv_group_create()`,
      * add objects to the group with `lv_group_add_obj(group, obj)`
      * and assign this input device to group to navigate in it:
-     * `lv_indev_set_group(indev_keypad, group);` */
+     * `lv_indev_set_group(indev_encoder, group);` */
 
     /*------------------
      * Button
diff --git a/src/lv_core/lv_indev.c b/src/lv_core/lv_indev.c
index 2f5db6ad4..035100aaf 100644
--- a/src/lv_core/lv_indev.c
+++ b/src/lv_core/lv_indev.c
@@ -735,6 +735,12 @@ static void indev_encoder_proc(lv_indev_t * i, lv_indev_data_t * data)
  */
 static void indev_button_proc(lv_indev_t * i, lv_indev_data_t * data)
 {
+    /* Die gracefully if i->btn_points is NULL */
+    if (i->btn_points == NULL) {
+        LV_LOG_WARN("indev_button_proc: btn_points was  NULL");
+        return;
+    }
+	
     i->proc.types.pointer.act_point.x = i->btn_points[data->btn_id].x;
     i->proc.types.pointer.act_point.y = i->btn_points[data->btn_id].y;
 
diff --git a/src/lv_core/lv_refr.c b/src/lv_core/lv_refr.c
index 2992525f8..1474fe4a9 100644
--- a/src/lv_core/lv_refr.c
+++ b/src/lv_core/lv_refr.c
@@ -385,7 +385,7 @@ static void lv_refr_area(const lv_area_t * area_p)
         lv_coord_t w = lv_area_get_width(area_p);
         lv_coord_t h = lv_area_get_height(area_p);
         lv_coord_t y2 =
-            area_p->y2 >= lv_disp_get_ver_res(disp_refr) ? y2 = lv_disp_get_ver_res(disp_refr) - 1 : area_p->y2;
+            area_p->y2 >= lv_disp_get_ver_res(disp_refr) ? lv_disp_get_ver_res(disp_refr) - 1 : area_p->y2;
 
         int32_t max_row = (uint32_t)vdb->size / w;
 
diff --git a/src/lv_misc/lv_math.c b/src/lv_misc/lv_math.c
index ca0459a82..ecc75e29b 100644
--- a/src/lv_misc/lv_math.c
+++ b/src/lv_misc/lv_math.c
@@ -213,6 +213,26 @@ uint16_t lv_atan2(int x, int y)
     return degree;
 }
 
+/**
+ * Calculate the integer exponents.
+ * @param base
+ * @param power
+ * @return base raised to the power exponent
+ */
+int64_t lv_pow(int64_t base, int8_t exp)
+{
+	int64_t result = 1;
+    while (exp)
+    {
+        if (exp & 1)
+            result *= base;
+        exp >>= 1;
+        base *= base;
+    }
+
+    return result;
+}
+
 /**********************
  *   STATIC FUNCTIONS
  **********************/
diff --git a/src/lv_misc/lv_math.h b/src/lv_misc/lv_math.h
index 0bc5a74e1..2acfba64c 100644
--- a/src/lv_misc/lv_math.h
+++ b/src/lv_misc/lv_math.h
@@ -96,6 +96,14 @@ uint16_t lv_atan2(int x, int y);
  */
 LV_ATTRIBUTE_FAST_MEM void lv_sqrt(uint32_t x, lv_sqrt_res_t * q, uint32_t mask);
 
+/**
+ * Calculate the integer exponents.
+ * @param base
+ * @param power
+ * @return base raised to the power exponent
+ */
+int64_t lv_pow(int64_t base, int8_t exp);
+
 /**********************
  *      MACROS
  **********************/
diff --git a/src/lv_widgets/lv_spinbox.c b/src/lv_widgets/lv_spinbox.c
index 303fe52c9..a08151ebb 100644
--- a/src/lv_widgets/lv_spinbox.c
+++ b/src/lv_widgets/lv_spinbox.c
@@ -173,6 +173,13 @@ void lv_spinbox_set_digit_format(lv_obj_t * spinbox, uint8_t digit_count, uint8_
     if(separator_position >= digit_count) separator_position = 0;
     if(separator_position > LV_SPINBOX_MAX_DIGIT_COUNT) separator_position = LV_SPINBOX_MAX_DIGIT_COUNT;
 
+    if(digit_count < LV_SPINBOX_MAX_DIGIT_COUNT)
+    {
+        uint64_t max_val = lv_pow(10, digit_count);
+        if(ext->range_max > max_val - 1) ext->range_max = max_val - 1;
+        if(ext->range_min < - max_val  + 1) ext->range_min = - max_val  + 1;
+    }
+
     ext->digit_count   = digit_count;
     ext->dec_point_pos = separator_position;
 
diff --git a/src/lv_widgets/lv_spinbox.h b/src/lv_widgets/lv_spinbox.h
index 1f0293294..83c057f58 100644
--- a/src/lv_widgets/lv_spinbox.h
+++ b/src/lv_widgets/lv_spinbox.h
@@ -28,7 +28,7 @@ extern "C" {
 /*********************
  *      DEFINES
  *********************/
-#define LV_SPINBOX_MAX_DIGIT_COUNT 16
+#define LV_SPINBOX_MAX_DIGIT_COUNT 10
 
 /**********************
  *      TYPEDEFS