diff --git a/.gitignore b/.gitignore
index bbaecc6..21c7026 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@
 
 # # Builds
 build/
+app/release/
 app/src/main/assets/arm64-v8a
 app/src/main/assets/x86
 app/src/main/assets/tcl_aux
diff --git a/README b/README
new file mode 100644
index 0000000..0e32d7d
--- /dev/null
+++ b/README
@@ -0,0 +1,4 @@
+Privacy Policy
+--------------
+
+Palantir does not collect any of your personal data.
diff --git a/app/build.gradle b/app/build.gradle
index 4e4dc4b..a653e56 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -3,28 +3,24 @@ apply plugin: 'com.google.ar.sceneform.plugin'
 apply plugin: 'org.ajoberstar.grgit'
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion 28
     defaultConfig {
         applicationId "io.ningyuan.palantir"
 
         // AR Optional apps must declare minSdkVersion >= 14.
         // AR Required apps must declare minSdkVersion >= 24.
         minSdkVersion 24
-        targetSdkVersion 27
+        targetSdkVersion 28
         versionCode 1
-        versionName "1.0"
+        versionName "1.0.0"
         ndk {
             /*
              * Sceneform is available for the following ABIs:
              * 'arm64-v8a', 'armeabi-v7a', 'x86_64' and 'x86'.
              * Your application should include the ABIs most appropriate to
              * minimize APK size. Listing 'arm64-v8a' is recommended.
-             *
-             * This sample app includes two ABIs:
-             * 1. 'arm64-v8a' to run on devices
-             * 2. 'x86' to run in the Android emulator
              */
-            abiFilters 'arm64-v8a', 'x86'
+            abiFilters 'arm64-v8a'
         }
         externalNativeBuild {
             cmake {
@@ -90,8 +86,8 @@ preBuild.dependsOn fetchStrideSrc
 dependencies {
     implementation 'ch.acra:acra-dialog:5.4.0'
     implementation 'ch.acra:acra-mail:5.4.0'
-    implementation 'com.android.support:appcompat-v7:27.1.1'
-    implementation 'com.android.support:design:27.1.1'
+    implementation 'com.android.support:appcompat-v7:28.0.0'
+    implementation 'com.android.support:design:28.0.0'
     implementation 'com.google.ar.sceneform.ux:sceneform-ux:1.10.0'
     implementation 'com.google.ar.sceneform:assets:1.10.0'
     implementation 'commons-io:commons-io:2.6'
diff --git a/app/src/main/java/io/ningyuan/palantir/utils/PdbTitleSearcher.java b/app/src/main/java/io/ningyuan/palantir/utils/PdbTitleSearcher.java
index 8ca53d6..6d4c06f 100644
--- a/app/src/main/java/io/ningyuan/palantir/utils/PdbTitleSearcher.java
+++ b/app/src/main/java/io/ningyuan/palantir/utils/PdbTitleSearcher.java
@@ -31,6 +31,10 @@ public PdbTitleSearcher(PdbSearcher pdbSearcher, CursorAdapter adapter, LinkedLi
     protected Integer doInBackground(Integer... integers) {
         int indexToLoad = integers[0];
 
+        if (indexToLoad >= pdbs.size()) {
+            return indexToLoad + 1;  // value doesn't matter, will terminate at onPostExecute
+        }
+
         try {
             pdbs.get(indexToLoad).load();
         } catch (IOException e) {
diff --git a/app/src/main/java/io/ningyuan/palantir/views/SearchView.java b/app/src/main/java/io/ningyuan/palantir/views/SearchView.java
index 69cf704..21e2ae2 100644
--- a/app/src/main/java/io/ningyuan/palantir/views/SearchView.java
+++ b/app/src/main/java/io/ningyuan/palantir/views/SearchView.java
@@ -149,6 +149,7 @@ private void deactivate() {
             imm.hideSoftInputFromWindow(getWindowToken(), 0);
         }
 
+        pdbSearcher.makeInvalid();
         setVisibility(GONE);
         progressBar.setVisibility(GONE);
         suggestionAdapter.changeCursor(getEmptyCursor(false));
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 8236958..cdee41b 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -48,16 +48,11 @@
 
     <string name="ux_model_renderable_not_yet_set">Click on the bottom-right button to import a 3D model</string>
 
-    <string name="log_import_failed_io">Failed with IOException: </string>
-    <string name="log_write_temp_file_done">Done writing cache file from content URI: </string>
-    <string name="log_write_temp_file_start">Preparing to save cache file from content URI.</string>
-
-    <string name="error_import_failed_bad_render">Something went wrong: unable to render the import file.</string>
+    <string name="error_import_failed_bad_render">Something went wrong: unable to render PDB file.</string>
     <string name="error_import_failed_io">Something went wrong: unable to import the requested file.</string>
     <string name="error_insufficient_opengl_version">Palantir uses ARCore, which requires OpenGL ES 3.0 or later.</string>
     <string name="error_insufficient_sdk_version">Palantir uses ARCore, which requires Android N or later.</string>
-    <string name="error_no_model_renderable">You must first import a *.glb file!</string>
-    <string name="error_no_resolvable_activity">Something went wrong: there is no application configured to browse your filesystem.</string>
+    <string name="error_no_model_renderable">A PDB must be loaded first!</string>
 
     <string name="tcl_script_template">
         mol addfile %s \n