diff --git a/data/com.github.subhadeepjasu.ensembles.appdata.xml.in b/data/com.github.subhadeepjasu.ensembles.appdata.xml.in
index ab775f6a..600a04bb 100644
--- a/data/com.github.subhadeepjasu.ensembles.appdata.xml.in
+++ b/data/com.github.subhadeepjasu.ensembles.appdata.xml.in
@@ -87,6 +87,14 @@
     <content_attribute id="money-gambling">none</content_attribute>
   </content_rating>
   <releases>
+    <release version="0.0.16" date="2021-11-24">
+      <description>
+        <p>HotFix:</p>
+        <ul>
+          <li>Fixed a memory issue with style engine that only appears in flatpak build and causes crashes</li>
+        </ul>
+      </description>
+    </release>
     <release version="0.0.15" date="2021-11-21">
       <description>
         <p>New:</p>
diff --git a/meson.build b/meson.build
index b92b486c..af64f410 100644
--- a/meson.build
+++ b/meson.build
@@ -2,7 +2,7 @@
 project (
     'com.github.subhadeepjasu.ensembles',
     'c', 'vala',
-    version: '0.0.15',
+    version: '0.0.16',
 )
 
 # GNOME module
diff --git a/src/Core/MidiRecorder.vala b/src/Core/MidiRecorder.vala
index 93c591ad..9ccf6e68 100644
--- a/src/Core/MidiRecorder.vala
+++ b/src/Core/MidiRecorder.vala
@@ -393,7 +393,7 @@ namespace Ensembles.Core {
                 if (current_state == RecorderState.STOPPED) {
                     break;
                 }
-                Thread.usleep (10000);
+                Thread.usleep (45454);
                 if (current_state == RecorderState.STOPPED) {
                     break;
                 }
diff --git a/src/Core/style_player.c b/src/Core/style_player.c
index 852b0348..66af656c 100644
--- a/src/Core/style_player.c
+++ b/src/Core/style_player.c
@@ -90,7 +90,7 @@ int style_original_chord_main = 0;
 typedef void
 (*style_player_change_state_callback)(gint state);
 
-style_player_change_state_callback state_change_callback;
+static style_player_change_state_callback state_change_callback;
 
 void
 set_style_change_callback (style_player_change_state_callback callback) {
diff --git a/src/Core/synthesizer.c b/src/Core/synthesizer.c
index ff63d3da..7af1de87 100644
--- a/src/Core/synthesizer.c
+++ b/src/Core/synthesizer.c
@@ -151,7 +151,7 @@ typedef void
                         gfloat** output_r,
                         gint* output_r_length1);
 
-synthesizer_fx_callback fx_callback;
+static synthesizer_fx_callback fx_callback;
 
 void
 set_fx_callback (synthesizer_fx_callback callback) {