diff --git a/sample/sample-plugins/defer/simple.c b/sample/sample-plugins/defer/simple.c
index d18695b5..64338b4a 100644
--- a/sample/sample-plugins/defer/simple.c
+++ b/sample/sample-plugins/defer/simple.c
@@ -141,6 +141,11 @@ openvpn_plugin_open_v1(unsigned int *type_mask, const char *argv[], const char *
      * Allocate our context
      */
     context = (struct plugin_context *) calloc(1, sizeof(struct plugin_context));
+    if (context == NULL)
+    {
+        printf("PLUGIN: allocating memory for context failed\n");
+        return NULL;
+    }
 
     context->test_deferred_auth = atoi_null0(get_env("test_deferred_auth", envp));
     printf("TEST_DEFERRED_AUTH %d\n", context->test_deferred_auth);
diff --git a/sample/sample-plugins/keying-material-exporter-demo/keyingmaterialexporter.c b/sample/sample-plugins/keying-material-exporter-demo/keyingmaterialexporter.c
index b53f13f6..27275f33 100644
--- a/sample/sample-plugins/keying-material-exporter-demo/keyingmaterialexporter.c
+++ b/sample/sample-plugins/keying-material-exporter-demo/keyingmaterialexporter.c
@@ -92,6 +92,12 @@ openvpn_plugin_open_v3(const int version,
 {
     struct plugin *plugin = calloc(1, sizeof(*plugin));
 
+    if (plugin == NULL)
+    {
+        printf("PLUGIN: allocating memory for context failed\n");
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
+
     plugin->type = get_env("remote_1", args->envp) ? CLIENT : SERVER;
     plugin->log  = args->callbacks->plugin_log;
 
diff --git a/sample/sample-plugins/log/log.c b/sample/sample-plugins/log/log.c
index b5c1c3be..a782aa97 100644
--- a/sample/sample-plugins/log/log.c
+++ b/sample/sample-plugins/log/log.c
@@ -78,6 +78,11 @@ openvpn_plugin_open_v1(unsigned int *type_mask, const char *argv[], const char *
      * Allocate our context
      */
     context = (struct plugin_context *) calloc(1, sizeof(struct plugin_context));
+    if (context == NULL)
+    {
+        printf("PLUGIN: allocating memory for context failed\n");
+        return NULL;
+    }
 
     /*
      * Set the username/password we will require.
diff --git a/sample/sample-plugins/log/log_v3.c b/sample/sample-plugins/log/log_v3.c
index 17b83f3f..13444997 100644
--- a/sample/sample-plugins/log/log_v3.c
+++ b/sample/sample-plugins/log/log_v3.c
@@ -113,6 +113,11 @@ openvpn_plugin_open_v3(const int v3structver,
 
     /* Allocate our context */
     context = (struct plugin_context *) calloc(1, sizeof(struct plugin_context));
+    if (context == NULL)
+    {
+        printf("PLUGIN: allocating memory for context failed\n");
+        return OPENVPN_PLUGIN_FUNC_ERROR;
+    }
 
     /* Set the username/password we will require. */
     context->username = "foo";
diff --git a/sample/sample-plugins/simple/simple.c b/sample/sample-plugins/simple/simple.c
index 950c547e..60cfea4f 100644
--- a/sample/sample-plugins/simple/simple.c
+++ b/sample/sample-plugins/simple/simple.c
@@ -80,6 +80,11 @@ openvpn_plugin_open_v1(unsigned int *type_mask, const char *argv[], const char *
      * Allocate our context
      */
     context = (struct plugin_context *) calloc(1, sizeof(struct plugin_context));
+    if (context == NULL)
+    {
+        printf("PLUGIN: allocating memory for context failed\n");
+        return NULL;
+    }
 
     /*
      * Set the username/password we will require.