diff --git a/app/src/main/java/com/greenart7c3/nostrsigner/database/ApplicationEntity.kt b/app/src/main/java/com/greenart7c3/nostrsigner/database/ApplicationEntity.kt
index fbc30038..225473f8 100644
--- a/app/src/main/java/com/greenart7c3/nostrsigner/database/ApplicationEntity.kt
+++ b/app/src/main/java/com/greenart7c3/nostrsigner/database/ApplicationEntity.kt
@@ -16,7 +16,11 @@ import kotlin.collections.joinToString
 
 fun generateBunkerPrivKey(): String = Nip01Crypto.privKeyCreate().toHexKey()
 
-fun localPubKeyFromPrivKey(privKeyHex: String): String = KeyPair(privKey = privKeyHex.hexToByteArray()).pubKey.toHexKey()
+fun localPubKeyFromPrivKey(privKeyHex: String): String = try {
+    KeyPair(privKey = privKeyHex.hexToByteArray()).pubKey.toHexKey()
+} catch (_: Exception) {
+    ""
+}
 
 @Entity(
     tableName = "application",
diff --git a/app/src/main/java/com/greenart7c3/nostrsigner/service/BunkerRequestUtils.kt b/app/src/main/java/com/greenart7c3/nostrsigner/service/BunkerRequestUtils.kt
index c0db03e3..15eaefb3 100644
--- a/app/src/main/java/com/greenart7c3/nostrsigner/service/BunkerRequestUtils.kt
+++ b/app/src/main/java/com/greenart7c3/nostrsigner/service/BunkerRequestUtils.kt
@@ -143,7 +143,11 @@ object BunkerRequestUtils {
         onDone: (Boolean) -> Unit,
     ) {
         val connSigner = if (bunkerRequest.signerPrivKey.isNotEmpty()) {
-            NostrSignerInternal(KeyPair(privKey = bunkerRequest.signerPrivKey.hexToByteArray()))
+            try {
+                NostrSignerInternal(KeyPair(privKey = bunkerRequest.signerPrivKey.hexToByteArray()))
+            } catch (_: Exception) {
+                null
+            }
         } else {
             null
         }
diff --git a/app/src/test/java/com/greenart7c3/nostrsigner/database/ApplicationEntityTest.kt b/app/src/test/java/com/greenart7c3/nostrsigner/database/ApplicationEntityTest.kt
new file mode 100644
index 00000000..21ae0389
--- /dev/null
+++ b/app/src/test/java/com/greenart7c3/nostrsigner/database/ApplicationEntityTest.kt
@@ -0,0 +1,40 @@
+package com.greenart7c3.nostrsigner.database
+
+import com.vitorpamplona.quartz.nip01Core.core.toHexKey
+import com.vitorpamplona.quartz.nip01Core.crypto.KeyPair
+import com.vitorpamplona.quartz.nip01Core.crypto.Nip01Crypto
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class ApplicationEntityTest {
+
+    @Test
+    fun `localPubKey returns empty string for empty localKey`() {
+        val app = ApplicationEntity.empty().copy(localKey = "")
+        assertEquals("", app.localPubKey)
+    }
+
+    @Test
+    fun `localPubKey returns empty string for invalid localKey`() {
+        // "invalid-key" is not valid hex and not 32 bytes
+        val app = ApplicationEntity.empty().copy(localKey = "invalid-key")
+        assertEquals("", app.localPubKey)
+    }
+
+    @Test
+    fun `localPubKey returns empty string for wrong sized hex localKey`() {
+        // 31 bytes instead of 32
+        val app = ApplicationEntity.empty().copy(localKey = "00".repeat(31))
+        assertEquals("", app.localPubKey)
+    }
+
+    @Test
+    fun `localPubKey returns valid pubkey for valid 32 byte hex localKey`() {
+        val privKey = Nip01Crypto.privKeyCreate()
+        val privKeyHex = privKey.toHexKey()
+        val app = ApplicationEntity.empty().copy(localKey = privKeyHex)
+
+        val expectedPubKey = KeyPair(privKey = privKey).pubKey.toHexKey()
+        assertEquals(expectedPubKey, app.localPubKey)
+    }
+}