diff --git a/app/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt b/app/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt
index 2cd3422a8..40d011339 100644
--- a/app/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt
+++ b/app/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt
@@ -2,6 +2,7 @@ package com.vitorpamplona.amethyst.model
 
 import android.util.Log
 import com.vitorpamplona.amethyst.Amethyst
+import com.vitorpamplona.amethyst.service.checkNotInMainThread
 import com.vitorpamplona.amethyst.service.model.*
 import com.vitorpamplona.amethyst.service.nip19.Nip19
 import com.vitorpamplona.amethyst.service.relays.Relay
@@ -850,6 +851,8 @@ object LocalCache {
     }
 
     fun findUsersStartingWith(username: String): List<User> {
+        checkNotInMainThread()
+
         val key = decodePublicKeyAsHexOrNull(username)
 
         if (key != null && users[key] != null) {
@@ -864,6 +867,8 @@ object LocalCache {
     }
 
     fun findNotesStartingWith(text: String): List<Note> {
+        checkNotInMainThread()
+
         val key = try {
             Nip19.uriToRoute(text)?.hex ?: Hex.decode(text).toHexKey()
         } catch (e: Exception) {
@@ -889,6 +894,8 @@ object LocalCache {
     }
 
     fun findChannelsStartingWith(text: String): List<Channel> {
+        checkNotInMainThread()
+
         val key = try {
             Nip19.uriToRoute(text)?.hex ?: Hex.decode(text).toHexKey()
         } catch (e: Exception) {
@@ -917,6 +924,8 @@ object LocalCache {
     }
 
     fun pruneOldAndHiddenMessages(account: Account) {
+        checkNotInMainThread()
+
         channels.forEach { it ->
             val toBeRemoved = it.value.pruneOldAndHiddenMessages(account)
 
@@ -935,6 +944,8 @@ object LocalCache {
     }
 
     fun pruneHiddenMessages(account: Account) {
+        checkNotInMainThread()
+
         val toBeRemoved = account.hiddenUsers.map {
             (users[it]?.notes ?: emptySet())
         }.flatten()
@@ -962,6 +973,8 @@ object LocalCache {
     }
 
     fun pruneContactLists(userAccount: Account) {
+        checkNotInMainThread()
+
         var removingContactList = 0
         users.values.forEach {
             if (it != userAccount.userProfile() && (it.liveSet == null || it.liveSet?.isInUse() == false) && it.latestContactList != null) {
@@ -981,6 +994,8 @@ object LocalCache {
     }
 
     fun consume(event: Event, relay: Relay?) {
+        checkNotInMainThread()
+
         if (!event.hasValidSignature()) return
 
         try {
diff --git a/app/src/main/java/com/vitorpamplona/amethyst/service/BlurHashImage.kt b/app/src/main/java/com/vitorpamplona/amethyst/service/BlurHashImage.kt
index 8e6ae470d..5f4765b5e 100644
--- a/app/src/main/java/com/vitorpamplona/amethyst/service/BlurHashImage.kt
+++ b/app/src/main/java/com/vitorpamplona/amethyst/service/BlurHashImage.kt
@@ -20,6 +20,8 @@ class BlurHashFetcher(
 ) : Fetcher {
 
     override suspend fun fetch(): FetchResult {
+        checkNotInMainThread()
+
         val encodedHash = data.toString().removePrefix("bluehash:")
         val hash = URLDecoder.decode(encodedHash, "utf-8")
 
diff --git a/app/src/main/java/com/vitorpamplona/amethyst/service/MainThreadChecker.kt b/app/src/main/java/com/vitorpamplona/amethyst/service/MainThreadChecker.kt
new file mode 100644
index 000000000..a1903785b
--- /dev/null
+++ b/app/src/main/java/com/vitorpamplona/amethyst/service/MainThreadChecker.kt
@@ -0,0 +1,11 @@
+package com.vitorpamplona.amethyst.service
+
+import android.os.Looper
+
+fun checkNotInMainThread() {
+    if (isMainThread()) throw OnMainThreadException("It should not be in the MainThread")
+}
+
+fun isMainThread() = Looper.myLooper() == Looper.getMainLooper()
+
+class OnMainThreadException(str: String) : RuntimeException(str)
diff --git a/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/CardFeedViewModel.kt b/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/CardFeedViewModel.kt
index c2463d51d..c154723a4 100644
--- a/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/CardFeedViewModel.kt
+++ b/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/CardFeedViewModel.kt
@@ -10,6 +10,7 @@ import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.model.User
+import com.vitorpamplona.amethyst.service.checkNotInMainThread
 import com.vitorpamplona.amethyst.service.model.BadgeAwardEvent
 import com.vitorpamplona.amethyst.service.model.ChannelCreateEvent
 import com.vitorpamplona.amethyst.service.model.ChannelMetadataEvent
@@ -79,6 +80,8 @@ open class CardFeedViewModel(val localFilter: FeedFilter<Note>) : ViewModel() {
 
     @Synchronized
     private fun refreshSuspended() {
+        checkNotInMainThread()
+
         val notes = localFilter.feed()
 
         val thisAccount = (localFilter as? NotificationFeedFilter)?.account
@@ -117,6 +120,8 @@ open class CardFeedViewModel(val localFilter: FeedFilter<Note>) : ViewModel() {
     }
 
     private fun convertToCard(notes: Collection<Note>): List<Card> {
+        checkNotInMainThread()
+
         val reactionsPerEvent = mutableMapOf<Note, MutableList<Note>>()
         notes
             .filter { it.event is ReactionEvent }
diff --git a/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/FeedViewModel.kt b/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/FeedViewModel.kt
index 9422e4c6f..48b8ea54f 100644
--- a/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/FeedViewModel.kt
+++ b/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/FeedViewModel.kt
@@ -9,6 +9,7 @@ import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.model.User
+import com.vitorpamplona.amethyst.service.checkNotInMainThread
 import com.vitorpamplona.amethyst.ui.components.BundledInsert
 import com.vitorpamplona.amethyst.ui.components.BundledUpdate
 import com.vitorpamplona.amethyst.ui.dal.AdditiveFeedFilter
@@ -148,6 +149,8 @@ abstract class FeedViewModel(val localFilter: FeedFilter<Note>) : ViewModel() {
     }
 
     fun refreshSuspended() {
+        checkNotInMainThread()
+
         val notes = newListFromDataSource()
 
         val oldNotesState = _feedContent.value
diff --git a/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/LnZapFeedViewModel.kt b/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/LnZapFeedViewModel.kt
index b05c3f0df..afc273e86 100644
--- a/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/LnZapFeedViewModel.kt
+++ b/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/LnZapFeedViewModel.kt
@@ -5,6 +5,7 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.service.checkNotInMainThread
 import com.vitorpamplona.amethyst.ui.components.BundledUpdate
 import com.vitorpamplona.amethyst.ui.dal.FeedFilter
 import com.vitorpamplona.amethyst.ui.dal.UserProfileZapsFeedFilter
@@ -30,6 +31,7 @@ open class LnZapFeedViewModel(val dataSource: FeedFilter<Pair<Note, Note>>) : Vi
     }
 
     private fun refreshSuspended() {
+        checkNotInMainThread()
         val notes = dataSource.loadTop()
 
         val oldNotesState = _feedContent.value
diff --git a/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/UserFeedViewModel.kt b/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/UserFeedViewModel.kt
index 8783471af..a82145806 100644
--- a/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/UserFeedViewModel.kt
+++ b/app/src/main/java/com/vitorpamplona/amethyst/ui/screen/UserFeedViewModel.kt
@@ -7,6 +7,7 @@ import androidx.lifecycle.viewModelScope
 import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.User
+import com.vitorpamplona.amethyst.service.checkNotInMainThread
 import com.vitorpamplona.amethyst.ui.components.BundledUpdate
 import com.vitorpamplona.amethyst.ui.dal.FeedFilter
 import com.vitorpamplona.amethyst.ui.dal.HiddenAccountsFeedFilter
@@ -58,6 +59,8 @@ open class UserFeedViewModel(val dataSource: FeedFilter<User>) : ViewModel() {
     }
 
     private fun refreshSuspended() {
+        checkNotInMainThread()
+
         val notes = dataSource.loadTop().toImmutableList()
 
         val oldNotesState = _feedContent.value