Android apk release crash foe sql lite query

Hi at all, i have build a signed apk relese mode for my app using the way describe into android course and this is my build.grandle: ''' buildscript { repositories { maven { url 'https://maven.fabric.io/public' } }

dependencies {
    classpath 'io.fabric.tools:gradle:1.+'
}

} apply plugin: 'com.android.application' apply plugin: 'io.fabric'

repositories { maven { url 'https://maven.fabric.io/public' } }

android { compileSdkVersion 22 buildToolsVersion "22.0.1"

defaultConfig {
    applicationId "it.ingv.android"
    minSdkVersion 16
    targetSdkVersion 21
    versionCode 0
    versionName "5"
}

buildTypes {
    release {
        minifyEnabled true
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
}

}

dependencies { compile 'com.google.android.gms:play-services:3.2.25' compile files('libs/commons-io-2.4.jar') compile files('libs/gson-2.2.4.jar') compile files('libs/nineoldandroids-library-2.4.0.jar') compile 'com.github.nirhart:parallaxscroll:1.0' compile 'com.android.support:appcompat-v7:21.0.3' compile files('libs/Volley.jar') compile project(':PullToRefreshmaster') compile('com.crashlytics.sdk.android:crashlytics:2.5.2@aar') { transitive = true; } compile files('libs/picasso-2.5.2.jar') compile 'com.nispok:snackbar:2.11.0' compile 'com.williammora:snackbar:1.4.0' compile('com.crashlytics.sdk.android:crashlytics-ndk:1.1.1@aar') { transitive = true; } compile 'me.drakeet.materialdialog:library:1.2.2'

}

crashlytics { enableNdk true androidNdkOut 'src/main/obj' androidNdkLibsOut 'src/main/libs' }

'''

now when i have istalled apk and run app my app crash when i run a function for query on sqlite db, but if i run app on genymotion emulator there isn't a crash.

i have set this in proguard-rules:

-assumenosideeffects class android.util.Log { public static boolean isLoggable(java.lang.String, int); public static int v(...); public static int i(...); public static int w(...); public static int d(...); public static int e(...); }

-dontwarn com.squareup.okhttp.* -keep class com.db.models.** -keepclassmembers class com.db.models.** { ; } -keep class android.app.Activity -keep class android.app.* -keep class org.sqlite.** { ; } -keep class org.sqlite.database.* { *; }

Any help please? Thanks