diff --git a/native/com_wolfssl_WolfSSLContext.c b/native/com_wolfssl_WolfSSLContext.c
index 1383315..f5c5a8b 100644
--- a/native/com_wolfssl_WolfSSLContext.c
+++ b/native/com_wolfssl_WolfSSLContext.c
@@ -1112,9 +1112,13 @@ JNIEXPORT jint JNICALL Java_com_wolfssl_WolfSSLContext_setCipherList
 
     cipherList = (*jenv)->GetStringUTFChars(jenv, list, 0);
 
-    ret = (jint) wolfSSL_CTX_set_cipher_list(ctx, cipherList);
-
-    (*jenv)->ReleaseStringUTFChars(jenv, list, cipherList);
+    if (cipherList == NULL) {
+        ret = (jint)SSL_FAILURE;
+    }
+    else {
+        ret = (jint) wolfSSL_CTX_set_cipher_list(ctx, cipherList);
+        (*jenv)->ReleaseStringUTFChars(jenv, list, cipherList);
+    }
 
     return ret;
 }
@@ -2249,9 +2253,13 @@ JNIEXPORT jint JNICALL Java_com_wolfssl_WolfSSLContext_setOCSPOverrideUrl
 
     url = (*jenv)->GetStringUTFChars(jenv, urlString, 0);
 
-    ret = (jint) wolfSSL_CTX_SetOCSP_OverrideURL(ctx, url);
-
-    (*jenv)->ReleaseStringUTFChars(jenv, urlString, url);
+    if (url == NULL) {
+        ret = (jint)SSL_FAILURE;
+    }
+    else {
+        ret = (jint) wolfSSL_CTX_SetOCSP_OverrideURL(ctx, url);
+        (*jenv)->ReleaseStringUTFChars(jenv, urlString, url);
+    }
 
     return ret;
 #else
@@ -7068,9 +7076,13 @@ JNIEXPORT jint JNICALL Java_com_wolfssl_WolfSSLContext_set1SigAlgsList
 
     sigAlgList = (*jenv)->GetStringUTFChars(jenv, list, 0);
 
-    ret = wolfSSL_CTX_set1_sigalgs_list(ctx, sigAlgList);
-
-    (*jenv)->ReleaseStringUTFChars(jenv, list, sigAlgList);
+    if (sigAlgList == NULL) {
+        ret = WOLFSSL_FAILURE;
+    }
+    else {
+        ret = wolfSSL_CTX_set1_sigalgs_list(ctx, sigAlgList);
+        (*jenv)->ReleaseStringUTFChars(jenv, list, sigAlgList);
+    }
 
     return (jint)ret;
 #else
diff --git a/native/com_wolfssl_WolfSSLSession.c b/native/com_wolfssl_WolfSSLSession.c
index bce6477..dc0457c 100644
--- a/native/com_wolfssl_WolfSSLSession.c
+++ b/native/com_wolfssl_WolfSSLSession.c
@@ -2509,11 +2509,15 @@ JNIEXPORT jint JNICALL Java_com_wolfssl_WolfSSLSession_setCipherList
         return SSL_FAILURE;
     }
 
-    cipherList= (*jenv)->GetStringUTFChars(jenv, list, 0);
+    cipherList = (*jenv)->GetStringUTFChars(jenv, list, 0);
 
-    ret = (jint) wolfSSL_set_cipher_list(ssl, cipherList);
-
-    (*jenv)->ReleaseStringUTFChars(jenv, list, cipherList);
+    if (cipherList == NULL) {
+        ret = SSL_FAILURE;
+    }
+    else {
+        ret = (jint) wolfSSL_set_cipher_list(ssl, cipherList);
+        (*jenv)->ReleaseStringUTFChars(jenv, list, cipherList);
+    }
 
     return ret;
 }
@@ -6275,9 +6279,13 @@ JNIEXPORT jint JNICALL Java_com_wolfssl_WolfSSLSession_set1SigAlgsList
 
     sigAlgList = (*jenv)->GetStringUTFChars(jenv, list, 0);
 
-    ret = wolfSSL_set1_sigalgs_list(ssl, sigAlgList);
-
-    (*jenv)->ReleaseStringUTFChars(jenv, list, sigAlgList);
+    if (sigAlgList == NULL) {
+        ret = SSL_FAILURE;
+    }
+    else {
+        ret = wolfSSL_set1_sigalgs_list(ssl, sigAlgList);
+        (*jenv)->ReleaseStringUTFChars(jenv, list, sigAlgList);
+    }
 
     return (jint)ret;
 #else