diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index f75e671..09a3ba7 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -29,7 +29,6 @@
         app:itemPadding="10dp"
         app:iconTint="#C8FFFFFF"
         app:iconTintActive="#FFFFFF"
-        app:duration="200"
         app:menu="@menu/menu_bottom"
         app:layout_constraintBottom_toBottomOf="parent"/>
 
diff --git a/lib/src/main/java/me/ibrahimsn/lib/BottomBarItem.kt b/lib/src/main/java/me/ibrahimsn/lib/BottomBarItem.kt
index 127337f..f4e5eb2 100644
--- a/lib/src/main/java/me/ibrahimsn/lib/BottomBarItem.kt
+++ b/lib/src/main/java/me/ibrahimsn/lib/BottomBarItem.kt
@@ -5,7 +5,7 @@ import android.graphics.drawable.Drawable
 
 data class BottomBarItem(
     var title: String,
-    val icon: Drawable?,
+    val icon: Drawable,
     var rect: RectF = RectF(),
     var alpha: Int
 )
\ No newline at end of file
diff --git a/lib/src/main/java/me/ibrahimsn/lib/BottomBarParser.kt b/lib/src/main/java/me/ibrahimsn/lib/BottomBarParser.kt
index 19291a7..356a8f3 100644
--- a/lib/src/main/java/me/ibrahimsn/lib/BottomBarParser.kt
+++ b/lib/src/main/java/me/ibrahimsn/lib/BottomBarParser.kt
@@ -35,13 +35,8 @@ class BottomBarParser(private val context: Context, @XmlRes res: Int) {
 
         for (index in 0 until attributeCount) {
             when (parser.getAttributeName(index)) {
-                ICON_ATTRIBUTE -> {
-                    itemDrawable = try {
-                        ContextCompat.getDrawable(context, parser.getAttributeResourceValue(index, 0))
-                    } catch (notFoundException: Resources.NotFoundException) {
-                        null
-                    }
-                }
+                ICON_ATTRIBUTE ->
+                    itemDrawable = ContextCompat.getDrawable(context, parser.getAttributeResourceValue(index, 0))
                 TITLE_ATTRIBUTE -> {
                     itemText = try {
                         context.getString(parser.getAttributeResourceValue(index, 0))
@@ -52,6 +47,9 @@ class BottomBarParser(private val context: Context, @XmlRes res: Int) {
             }
         }
 
+        if (itemDrawable == null)
+            throw Throwable("Item icon can not be null!")
+
         return BottomBarItem(itemText ?: "", itemDrawable, alpha = 0)
     }
 }
\ No newline at end of file
diff --git a/lib/src/main/java/me/ibrahimsn/lib/Constants.kt b/lib/src/main/java/me/ibrahimsn/lib/Constants.kt
index c96fb04..168ff1b 100644
--- a/lib/src/main/java/me/ibrahimsn/lib/Constants.kt
+++ b/lib/src/main/java/me/ibrahimsn/lib/Constants.kt
@@ -14,7 +14,7 @@ object Constants {
 
     const val DEFAULT_SIDE_MARGIN = 10f
     const val DEFAULT_ITEM_PADDING = 10f
-    const val DEFAULT_ANIM_DURATION = 300L
+    const val DEFAULT_ANIM_DURATION = 200L
     const val DEFAULT_ICON_SIZE = 18F
     const val DEFAULT_ICON_MARGIN = 4F
     const val DEFAULT_TEXT_SIZE = 11F
diff --git a/lib/src/main/java/me/ibrahimsn/lib/SmoothBottomBar.kt b/lib/src/main/java/me/ibrahimsn/lib/SmoothBottomBar.kt
index a5ca5b1..ea20898 100644
--- a/lib/src/main/java/me/ibrahimsn/lib/SmoothBottomBar.kt
+++ b/lib/src/main/java/me/ibrahimsn/lib/SmoothBottomBar.kt
@@ -9,6 +9,7 @@ import android.graphics.Color
 import android.graphics.Paint
 import android.graphics.RectF
 import android.util.AttributeSet
+import android.util.Log
 import android.view.MotionEvent
 import android.view.View
 import android.view.animation.DecelerateInterpolator
@@ -157,17 +158,16 @@ class SmoothBottomBar : View {
         for ((index, item) in items.withIndex()) {
             val textLength = paintText.measureText(item.title)
 
-            if (item.icon != null) {
-                item.icon.mutate()
-                item.icon.setBounds(item.rect.centerX().toInt() - itemIconSize.toInt() / 2 - ((textLength / 2) * (1 - (OPAQUE - item.alpha) / OPAQUE)).toInt(),
-                    height / 2 - itemIconSize.toInt() / 2,
-                    item.rect.centerX().toInt() + itemIconSize.toInt() / 2 - ((textLength / 2) * (1 - (OPAQUE - item.alpha) / OPAQUE)).toInt(),
-                    height / 2 + itemIconSize.toInt() / 2
-                )
+            item.icon.mutate()
+            item.icon.setBounds(item.rect.centerX().toInt() - itemIconSize.toInt() / 2 - ((textLength / 2) * (1 - (OPAQUE - item.alpha) / OPAQUE.toFloat())).toInt(),
+                height / 2 - itemIconSize.toInt() / 2,
+                item.rect.centerX().toInt() + itemIconSize.toInt() / 2 - ((textLength / 2) * (1 - (OPAQUE - item.alpha) / OPAQUE.toFloat())).toInt(),
+                height / 2 + itemIconSize.toInt() / 2
+            )
+
+            DrawableCompat.setTint(item.icon, if(index == activeItemIndex) currentIconTint else itemIconTint)
+            item.icon.draw(canvas)
 
-                DrawableCompat.setTint(item.icon, if(index == activeItemIndex) currentIconTint else itemIconTint)
-                item.icon.draw(canvas)
-            }
             this.paintText.alpha = item.alpha
             canvas.drawText(item.title, item.rect.centerX() + itemIconSize / 2 + itemIconMargin, item.rect.centerY() - textHeight, paintText)
         }
@@ -205,14 +205,15 @@ class SmoothBottomBar : View {
 
     fun setActiveItem(pos: Int) {
         activeItemIndex = pos
-        animateIndicator(pos)
+
         for ((index, item) in items.withIndex()) {
-            if (index == pos) {
+            if (index == pos)
                 animateAlpha(item, OPAQUE)
-            } else {
+             else
                 animateAlpha(item, TRANSPARENT)
-            }
         }
+
+        animateIndicator(pos)
         animateIconTint()
     }