diff --git a/src/key_io.cpp b/src/key_io.cpp
index d9980895356f3..1d53a5e074dc8 100644
--- a/src/key_io.cpp
+++ b/src/key_io.cpp
@@ -142,7 +142,9 @@ CKey DecodeSecret(const std::string& str)
             key.Set(data.begin() + privkey_prefix.size(), data.begin() + privkey_prefix.size() + 32, compressed);
         }
     }
-    memory_cleanse(data.data(), data.size());
+    if (!data.empty()) {
+        memory_cleanse(data.data(), data.size());
+    }
     return key;
 }
 
diff --git a/test/sanitizer_suppressions/ubsan b/test/sanitizer_suppressions/ubsan
index f0107f1361641..d55119b2662e8 100644
--- a/test/sanitizer_suppressions/ubsan
+++ b/test/sanitizer_suppressions/ubsan
@@ -4,7 +4,6 @@ bool:wallet/wallet.cpp
 float-divide-by-zero:policy/fees.cpp
 float-divide-by-zero:validation.cpp
 float-divide-by-zero:wallet/wallet.cpp
-nonnull-attribute:support/cleanse.cpp
 unsigned-integer-overflow:arith_uint256.h
 unsigned-integer-overflow:basic_string.h
 unsigned-integer-overflow:bench/bench.h