diff --git a/src/libexpr/eval-cache.cc b/src/libexpr/eval-cache.cc
index ea3319f99..0042eebe0 100644
--- a/src/libexpr/eval-cache.cc
+++ b/src/libexpr/eval-cache.cc
@@ -418,6 +418,14 @@ Value & AttrCursor::getValue()
     return **_value;
 }
 
+void AttrCursor::fetchCachedValue()
+{
+    if (!cachedValue)
+        cachedValue = root->db->getAttr(getKey());
+    if (cachedValue && std::get_if<failed_t>(&cachedValue->second) && parent)
+        throw CachedEvalError(ref(parent->first), parent->second);
+}
+
 std::vector<Symbol> AttrCursor::getAttrPath() const
 {
     if (parent) {
@@ -494,8 +502,7 @@ Suggestions AttrCursor::getSuggestionsForAttr(Symbol name)
 std::shared_ptr<AttrCursor> AttrCursor::maybeGetAttr(Symbol name)
 {
     if (root->db) {
-        if (!cachedValue)
-            cachedValue = root->db->getAttr(getKey());
+        fetchCachedValue();
 
         if (cachedValue) {
             if (auto attrs = std::get_if<std::vector<Symbol>>(&cachedValue->second)) {
@@ -585,8 +592,7 @@ OrSuggestions<ref<AttrCursor>> AttrCursor::findAlongAttrPath(const std::vector<S
 std::string AttrCursor::getString()
 {
     if (root->db) {
-        if (!cachedValue)
-            cachedValue = root->db->getAttr(getKey());
+        fetchCachedValue();
         if (cachedValue && !std::get_if<placeholder_t>(&cachedValue->second)) {
             if (auto s = std::get_if<string_t>(&cachedValue->second)) {
                 debug("using cached string attribute '%s'", getAttrPathStr());
@@ -607,8 +613,7 @@ std::string AttrCursor::getString()
 string_t AttrCursor::getStringWithContext()
 {
     if (root->db) {
-        if (!cachedValue)
-            cachedValue = root->db->getAttr(getKey());
+        fetchCachedValue();
         if (cachedValue && !std::get_if<placeholder_t>(&cachedValue->second)) {
             if (auto s = std::get_if<string_t>(&cachedValue->second)) {
                 bool valid = true;
@@ -654,8 +659,7 @@ string_t AttrCursor::getStringWithContext()
 bool AttrCursor::getBool()
 {
     if (root->db) {
-        if (!cachedValue)
-            cachedValue = root->db->getAttr(getKey());
+        fetchCachedValue();
         if (cachedValue && !std::get_if<placeholder_t>(&cachedValue->second)) {
             if (auto b = std::get_if<bool>(&cachedValue->second)) {
                 debug("using cached Boolean attribute '%s'", getAttrPathStr());
@@ -676,8 +680,7 @@ bool AttrCursor::getBool()
 NixInt AttrCursor::getInt()
 {
     if (root->db) {
-        if (!cachedValue)
-            cachedValue = root->db->getAttr(getKey());
+        fetchCachedValue();
         if (cachedValue && !std::get_if<placeholder_t>(&cachedValue->second)) {
             if (auto i = std::get_if<int_t>(&cachedValue->second)) {
                 debug("using cached integer attribute '%s'", getAttrPathStr());
@@ -698,8 +701,7 @@ NixInt AttrCursor::getInt()
 std::vector<std::string> AttrCursor::getListOfStrings()
 {
     if (root->db) {
-        if (!cachedValue)
-            cachedValue = root->db->getAttr(getKey());
+        fetchCachedValue();
         if (cachedValue && !std::get_if<placeholder_t>(&cachedValue->second)) {
             if (auto l = std::get_if<std::vector<std::string>>(&cachedValue->second)) {
                 debug("using cached list of strings attribute '%s'", getAttrPathStr());
@@ -731,8 +733,7 @@ std::vector<std::string> AttrCursor::getListOfStrings()
 std::vector<Symbol> AttrCursor::getAttrs()
 {
     if (root->db) {
-        if (!cachedValue)
-            cachedValue = root->db->getAttr(getKey());
+        fetchCachedValue();
         if (cachedValue && !std::get_if<placeholder_t>(&cachedValue->second)) {
             if (auto attrs = std::get_if<std::vector<Symbol>>(&cachedValue->second)) {
                 debug("using cached attrset attribute '%s'", getAttrPathStr());
diff --git a/src/libexpr/eval-cache.hh b/src/libexpr/eval-cache.hh
index b1911e3a4..d37303b31 100644
--- a/src/libexpr/eval-cache.hh
+++ b/src/libexpr/eval-cache.hh
@@ -99,6 +99,14 @@ class AttrCursor : public std::enable_shared_from_this<AttrCursor>
 
     Value & getValue();
 
+    /**
+     * If `cachedValue` is unset, try to initialize it from the
+     * database. It is not an error if it does not exist. Throw a
+     * `CachedEvalError` exception if it does exist but has type
+     * `AttrType::Failed`.
+     */
+    void fetchCachedValue();
+
 public:
 
     AttrCursor(