diff --git a/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Config.kt b/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Config.kt
index 3421917c..3af7f77d 100644
--- a/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Config.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/clock/helpers/Config.kt
@@ -4,6 +4,7 @@ import android.content.Context
 import android.media.RingtoneManager
 import com.simplemobiletools.clock.extensions.gson.gson
 import com.simplemobiletools.clock.models.Alarm
+import com.simplemobiletools.clock.models.ObfuscatedTimer
 import com.simplemobiletools.clock.models.Timer
 import com.simplemobiletools.commons.extensions.getDefaultAlarmSound
 import com.simplemobiletools.commons.extensions.getDefaultAlarmTitle
@@ -70,10 +71,18 @@ class Config(context: Context) : BaseConfig(context) {
         set(alarm) = prefs.edit().putString(ALARM_LAST_CONFIG, gson.toJson(alarm)).apply()
 
     var timerLastConfig: Timer?
-        get() = prefs.getString(TIMER_LAST_CONFIG, null)?.let { lastAlarm ->
-            gson.fromJson(lastAlarm, Timer::class.java)
+        get() = prefs.getString(TIMER_LAST_CONFIG, null)?.let { lastTimer ->
+            try {
+                if (lastTimer.contains("\"b\"")) {
+                    gson.fromJson(lastTimer, ObfuscatedTimer::class.java).toTimer()
+                } else {
+                    gson.fromJson(lastTimer, Timer::class.java)
+                }
+            } catch (e: Exception) {
+                null
+            }
         }
-        set(alarm) = prefs.edit().putString(TIMER_LAST_CONFIG, gson.toJson(alarm)).apply()
+        set(timer) = prefs.edit().putString(TIMER_LAST_CONFIG, gson.toJson(timer)).apply()
 
     var timerChannelId: String?
         get() = prefs.getString(TIMER_CHANNEL_ID, null)
diff --git a/app/src/main/kotlin/com/simplemobiletools/clock/models/Timer.kt b/app/src/main/kotlin/com/simplemobiletools/clock/models/Timer.kt
index 1a8df393..a1242342 100644
--- a/app/src/main/kotlin/com/simplemobiletools/clock/models/Timer.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/clock/models/Timer.kt
@@ -1,9 +1,11 @@
 package com.simplemobiletools.clock.models
 
+import androidx.annotation.Keep
 import androidx.room.Entity
 import androidx.room.PrimaryKey
 
 @Entity(tableName = "timers")
+@Keep
 data class Timer(
     @PrimaryKey(autoGenerate = true) var id: Int?,
     var seconds: Int,
@@ -16,3 +18,31 @@ data class Timer(
     var channelId: String? = null,
     var oneShot: Boolean = false
 )
+
+@Keep
+data class ObfuscatedTimer(
+    var a: Int?,
+    var b: Int,
+    // We ignore timer state and will just use idle
+    val c: Map<Any, Any>,
+    var d: Boolean,
+    var e: String,
+    var f: String,
+    var g: String,
+    var h: Long,
+    var i: String? = null,
+    var j: Boolean = false
+) {
+    fun toTimer(): Timer = Timer(
+        a,
+        b,
+        TimerState.Idle,
+        d,
+        e,
+        f,
+        g,
+        h,
+        i,
+        j
+    )
+}
diff --git a/app/src/main/kotlin/com/simplemobiletools/clock/models/TimerState.kt b/app/src/main/kotlin/com/simplemobiletools/clock/models/TimerState.kt
index ad8f3a6e..a8a5e9c8 100644
--- a/app/src/main/kotlin/com/simplemobiletools/clock/models/TimerState.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/clock/models/TimerState.kt
@@ -1,8 +1,15 @@
 package com.simplemobiletools.clock.models
 
+import androidx.annotation.Keep
+
+@Keep
 sealed class TimerState {
+    @Keep
     object Idle : TimerState()
+    @Keep
     data class Running(val duration: Long, val tick: Long) : TimerState()
+    @Keep
     data class Paused(val duration: Long, val tick: Long) : TimerState()
+    @Keep
     object Finished : TimerState()
 }