diff --git a/esphome/components/ct_clamp/ct_clamp_sensor.cpp b/esphome/components/ct_clamp/ct_clamp_sensor.cpp
index 674cc0ae98..c1e3bec486 100644
--- a/esphome/components/ct_clamp/ct_clamp_sensor.cpp
+++ b/esphome/components/ct_clamp/ct_clamp_sensor.cpp
@@ -64,6 +64,8 @@ void CTClampSensor::loop() {
 
   // Perform a single sample
   float value = this->source_->sample();
+  if (isnan(value))
+    return;
 
   if (this->is_calibrating_offset_) {
     this->sample_sum_ += value;