diff --git a/libraries/SocketWrapper/src/MbedClient.cpp b/libraries/SocketWrapper/src/MbedClient.cpp
index 49188df7e..2bb933350 100644
--- a/libraries/SocketWrapper/src/MbedClient.cpp
+++ b/libraries/SocketWrapper/src/MbedClient.cpp
@@ -229,6 +229,8 @@ int arduino::MbedClient::available() {
}
int arduino::MbedClient::read() {
+ if (sock == nullptr)
+ return -1;
mutex->lock();
if (!available()) {
mutex->unlock();
@@ -241,6 +243,8 @@ int arduino::MbedClient::read() {
}
int arduino::MbedClient::read(uint8_t *data, size_t len) {
+ if (sock == nullptr)
+ return 0;
mutex->lock();
int avail = available();
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