diff --git a/android/src/main/java/com/pinmi/react/printer/RNBLEPrinterModule.java b/android/src/main/java/com/pinmi/react/printer/RNBLEPrinterModule.java
index 009c73f..f83cb65 100644
--- a/android/src/main/java/com/pinmi/react/printer/RNBLEPrinterModule.java
+++ b/android/src/main/java/com/pinmi/react/printer/RNBLEPrinterModule.java
@@ -45,7 +45,10 @@ public void init(Callback successCallback, Callback errorCallback) {
     @ReactMethod
     @Override
     public void closeConn() {
-        adapter.closeConnectionIfExists();
+        if (this.adapter == null) {
+            this.adapter = BLEPrinterAdapter.getInstance();
+        }
+        this.adapter.closeConnectionIfExists();
     }
 
     @ReactMethod
diff --git a/android/src/main/java/com/pinmi/react/printer/RNNetPrinterModule.java b/android/src/main/java/com/pinmi/react/printer/RNNetPrinterModule.java
index 01be611..36749f8 100644
--- a/android/src/main/java/com/pinmi/react/printer/RNNetPrinterModule.java
+++ b/android/src/main/java/com/pinmi/react/printer/RNNetPrinterModule.java
@@ -37,7 +37,9 @@ public void init(Callback successCallback, Callback errorCallback) {
     @ReactMethod
     @Override
     public void closeConn() {
-        this.adapter = NetPrinterAdapter.getInstance();
+        if (this.adapter == null) {
+            this.adapter = NetPrinterAdapter.getInstance();
+        }
         this.adapter.closeConnectionIfExists();
     }
 
diff --git a/android/src/main/java/com/pinmi/react/printer/RNUSBPrinterModule.java b/android/src/main/java/com/pinmi/react/printer/RNUSBPrinterModule.java
index 38ff3b3..6ea5fa8 100644
--- a/android/src/main/java/com/pinmi/react/printer/RNUSBPrinterModule.java
+++ b/android/src/main/java/com/pinmi/react/printer/RNUSBPrinterModule.java
@@ -42,7 +42,10 @@ public void init(Callback successCallback, Callback errorCallback) {
     @ReactMethod
     @Override
     public void closeConn()  {
-        adapter.closeConnectionIfExists();
+        if (this.adapter == null) {
+            this.adapter = USBPrinterAdapter.getInstance();
+        }
+        this.adapter.closeConnectionIfExists();
     }
 
     @ReactMethod