diff --git a/lib/api/api.c b/lib/api/api.c
index 06e5cb9..dc619f2 100644
--- a/lib/api/api.c
+++ b/lib/api/api.c
@@ -1165,6 +1165,10 @@ int setDirectory(char* Dir, int rw) {
 	if(openedFiles->validwDir) {
 	    free(openedFiles->wDir);
 	    openedFiles->wDir = NULL;
+	    openedFiles->validwDir = 0;
+	}
+	if(strncmp(Dir, "/dev/null", strlen("/dev/null")+1) == 0) {
+	    return 0;
 	}
 	openedFiles->validwDir = 1;
 	openedFiles->wDir = malloc(strlen(Dir)+1);
@@ -1173,6 +1177,10 @@ int setDirectory(char* Dir, int rw) {
 	if(openedFiles->validrDir) {
 	    free(openedFiles->rDir);
 	    openedFiles->rDir = NULL;
+	    openedFiles->validrDir = 0;
+	}
+	if(strncmp(Dir, "/dev/null", strlen("/dev/null")+1) == 0) {
+	    return 0;
 	}
 	openedFiles->validrDir = 1;
 	openedFiles->rDir = malloc(strlen(Dir)+1);