diff --git a/FRAM.cpp b/FRAM.cpp
index 9e2d169..74f50ad 100644
--- a/FRAM.cpp
+++ b/FRAM.cpp
@@ -604,7 +604,8 @@ uint32_t FRAM32::clear(uint8_t value)
 void FRAM32::_writeBlock(uint32_t memAddr, uint8_t * obj, uint8_t size)
 {
   uint8_t _addr = _address;
-  if (memAddr & 0x00010000) _addr += 0x01;
+  if (memAddr & 0xFFFE0000) return;  //  ignore invalid memory addresses
+  if ((memAddr & 0x00010000) == 0x00010000) _addr += 0x01;
 
   _wire->beginTransmission(_addr);
   _wire->write((uint8_t) (memAddr >> 8));
@@ -621,7 +622,8 @@ void FRAM32::_writeBlock(uint32_t memAddr, uint8_t * obj, uint8_t size)
 void FRAM32::_readBlock(uint32_t memAddr, uint8_t * obj, uint8_t size)
 {
   uint8_t _addr = _address;
-  if (memAddr & 0x00010000) _addr += 0x01;
+  if (memAddr & 0xFFFE0000) return;  //  ignore invalid memory addresses
+  if ((memAddr & 0x00010000) == 0x00010000) _addr += 0x01;
 
   _wire->beginTransmission(_addr);
   _wire->write((uint8_t) (memAddr >> 8));