diff --git a/cx9261adriver_c.cpp b/cx9261adriver_c.cpp
index d4f5679..e0376ef 100644
--- a/cx9261adriver_c.cpp
+++ b/cx9261adriver_c.cpp
@@ -513,37 +513,37 @@ void CX9261A_setSetPinFunc(CX9261A_SetPinFunc func) {
 
 #ifdef USE_LOGGING
 void CX9261A::logging(const std::string& msg) {
-    if(loggingFunc != NULL) {
-        loggingFunc(msg.c_str());
+    if(loggingFunc == NULL) {
+        exit(-1);
     }
-    exit(-1);
+    return loggingFunc(msg.c_str());
 }
 #endif
 
 void CX9261A::writeSpi(int address, int value) {
-    if(writeSpiFunc != NULL) {
-        writeSpiFunc(address, value); 
+    if(writeSpiFunc == NULL) {
+        exit(-1);
     }
-    exit(-1);
+    return writeSpiFunc(address, value); 
 }
 
 int CX9261A::readSpi(int address) {
-    if(readSpiFunc != NULL) {
-        return readSpiFunc(address);
+    if(readSpiFunc == NULL) {
+        exit(-1);
     }
-    exit(-1);
+    return readSpiFunc(address);
 }
 
 void CX9261A::pause(double ms) {
-    if(pauseFunc != NULL) {
-        return pauseFunc(ms);
+    if(pauseFunc == NULL) {
+        exit(-1);
     }
-    exit(-1);
+    return pauseFunc(ms);
 }
 
 void CX9261A::setPin(int pin, int value) {
-    if(setPinFunc != NULL) {
-        return setPinFunc(pin, value);
+    if(setPinFunc == NULL) {
+        exit(-1);
     }
-    exit(-1);
+    return setPinFunc(pin, value);
 }
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