diff --git a/include/rexy/string_base.tpp b/include/rexy/string_base.tpp
index ed75cc9..92845f9 100644
--- a/include/rexy/string_base.tpp
+++ b/include/rexy/string_base.tpp
@@ -139,8 +139,10 @@ namespace rexy{
 		if(newsize < m_cap)
 			return false;
 		string_intermediary tmp(newsize);
-		memcpy(tmp.get(), m_data, m_length);
-		tmp[m_length] = 0;
+		if(m_data){
+			memcpy(tmp.get(), m_data, m_length);
+			tmp[m_length] = 0;
+		}
 		*this = std::move(tmp);
 		return true;
 	}
@@ -152,7 +154,8 @@ namespace rexy{
 			m_data[m_length] = 0;
 		}else{
 			string_intermediary tmp(detail::max(m_length + len, m_cap*2));
-			memcpy(tmp.m_data, m_data, m_length);
+			if(m_data)
+				memcpy(tmp.m_data, m_data, m_length);
 			memcpy(tmp.m_data+m_length, data, len);
 			tmp.m_length = len+m_length;
 			tmp[m_length+len] = 0;