diff --git a/app/build.gradle b/app/build.gradle
index 49ecd7a8f5..03e76063ea 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -101,6 +101,7 @@ dependencies {
     }
     implementation project(":libsignal")
     implementation project(":libsession")
+    implementation project(":libsession-util")
     implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:$kotlinxJsonVersion"
     implementation "com.github.oxen-io.session-android-curve-25519:curve25519-java:$curve25519Version"
     implementation project(":liblazysodium")
diff --git a/libsession-util/src/main/cpp/contacts.cpp b/libsession-util/src/main/cpp/contacts.cpp
index f57ee1e2a3..6bdcb48df2 100644
--- a/libsession-util/src/main/cpp/contacts.cpp
+++ b/libsession-util/src/main/cpp/contacts.cpp
@@ -6,7 +6,9 @@ JNIEXPORT jobject JNICALL
 Java_network_loki_messenger_libsession_1util_Contacts_get(JNIEnv *env, jobject thiz,
                                                           jstring session_id) {
     auto contacts = ptrToContacts(env, thiz);
-    auto contact = contacts->get(env->GetStringUTFChars(session_id, nullptr));
+    auto session_id_chars = env->GetStringUTFChars(session_id, nullptr);
+    auto contact = contacts->get(session_id_chars);
+    env->ReleaseStringUTFChars(session_id, session_id_chars);
     if (!contact) return nullptr;
     jobject j_contact = serialize_contact(env, contact.value());
     return j_contact;
@@ -17,7 +19,9 @@ JNIEXPORT jobject JNICALL
 Java_network_loki_messenger_libsession_1util_Contacts_getOrCreate(JNIEnv *env, jobject thiz,
                                                                   jstring session_id) {
     auto contacts = ptrToContacts(env, thiz);
-    auto contact = contacts->get_or_create(env->GetStringUTFChars(session_id, nullptr));
+    auto session_id_chars = env->GetStringUTFChars(session_id, nullptr);
+    auto contact = contacts->get_or_create(session_id_chars);
+    env->ReleaseStringUTFChars(session_id, session_id_chars);
     return serialize_contact(env, contact);
 }
 
@@ -35,7 +39,11 @@ JNIEXPORT jboolean JNICALL
 Java_network_loki_messenger_libsession_1util_Contacts_erase(JNIEnv *env, jobject thiz,
                                                             jstring session_id) {
     auto contacts = ptrToContacts(env, thiz);
-    return contacts->erase(env->GetStringUTFChars(session_id, nullptr));
+    auto session_id_chars = env->GetStringUTFChars(session_id, nullptr);
+
+    bool result = contacts->erase(session_id_chars);
+    env->ReleaseStringUTFChars(session_id, session_id_chars);
+    return result;
 }
 extern "C"
 #pragma clang diagnostic push
diff --git a/libsession-util/src/main/cpp/user_profile.cpp b/libsession-util/src/main/cpp/user_profile.cpp
index 9c1d25f719..bb2f7dd7bc 100644
--- a/libsession-util/src/main/cpp/user_profile.cpp
+++ b/libsession-util/src/main/cpp/user_profile.cpp
@@ -40,7 +40,9 @@ Java_network_loki_messenger_libsession_1util_UserProfile_setName(
         jobject thiz,
         jstring newName) {
     auto profile = ptrToProfile(env, thiz);
-    profile->set_name(env->GetStringUTFChars(newName, nullptr));
+    auto name_chars = env->GetStringUTFChars(newName, nullptr);
+    profile->set_name(name_chars);
+    env->ReleaseStringUTFChars(newName, name_chars);
 }
 
 JNIEXPORT jstring JNICALL
@@ -76,6 +78,7 @@ Java_network_loki_messenger_libsession_1util_UserProfile_setPic(JNIEnv *env, job
     auto url = env->GetStringUTFChars(pic.first, nullptr);
     auto key = util::ustring_from_bytes(env, pic.second);
     profile->set_profile_pic(url, key);
+    env->ReleaseStringUTFChars(pic.first, url);
 }
 
 }
\ No newline at end of file
diff --git a/libsession-util/src/main/cpp/util.cpp b/libsession-util/src/main/cpp/util.cpp
index cc15969c7f..f988c3da4e 100644
--- a/libsession-util/src/main/cpp/util.cpp
+++ b/libsession-util/src/main/cpp/util.cpp
@@ -65,8 +65,12 @@ Java_network_loki_messenger_libsession_1util_util_Sodium_ed25519PkToCurve25519(J
                                                                                jbyteArray pk) {
     auto ed_pk = util::ustring_from_bytes(env, pk);
     std::array<unsigned char, 32> curve_pk; // NOLINT(cppcoreguidelines-pro-type-member-init)
-    crypto_sign_ed25519_pk_to_curve25519(curve_pk.data(), ed_pk.data());
-
+    int success = crypto_sign_ed25519_pk_to_curve25519(curve_pk.data(), ed_pk.data());
+    if (success != 0) {
+        jclass exception = env->FindClass("java/lang/Exception");
+        env->ThrowNew(exception, "Invalid crypto_sign_ed25519_pk_to_curve25519 operation");
+        return nullptr;
+    }
     jbyteArray curve_pk_jarray = util::bytes_from_ustring(env, session::ustring_view {curve_pk.data(), curve_pk.size()});
     return curve_pk_jarray;
 }
\ No newline at end of file