diff --git a/src/TinyGsmClientA6.h b/src/TinyGsmClientA6.h
index fe35b60..6dd9634 100644
--- a/src/TinyGsmClientA6.h
+++ b/src/TinyGsmClientA6.h
@@ -126,7 +126,7 @@ public:
         continue;
       }
       // TODO: Read directly into user buffer?
-      if (!rx.size()) {
+      if (!rx.size() && sock_connected) {
         at->maintain();
         //break;
       }
diff --git a/src/TinyGsmClientESP8266.h b/src/TinyGsmClientESP8266.h
index 51e9065..32cec81 100644
--- a/src/TinyGsmClientESP8266.h
+++ b/src/TinyGsmClientESP8266.h
@@ -108,7 +108,7 @@ public:
         continue;
       }
       // TODO: Read directly into user buffer?
-      if (!rx.size()) {
+      if (!rx.size() && sock_connected) {
         at->maintain();
         //break;
       }
diff --git a/src/TinyGsmClientM590.h b/src/TinyGsmClientM590.h
index a185e16..a5ae273 100644
--- a/src/TinyGsmClientM590.h
+++ b/src/TinyGsmClientM590.h
@@ -123,7 +123,7 @@ public:
         continue;
       }
       // TODO: Read directly into user buffer?
-      if (!rx.size()) {
+      if (!rx.size() && sock_connected) {
         at->maintain();
         //break;
       }