diff --git a/x-pack/plugins/code/public/components/symbol_tree/__test__/__snapshots__/symbol_tree.test.tsx.snap b/x-pack/plugins/code/public/components/symbol_tree/__test__/__snapshots__/symbol_tree.test.tsx.snap
index bb5e0986ed18d..f2b7685db3ec0 100644
--- a/x-pack/plugins/code/public/components/symbol_tree/__test__/__snapshots__/symbol_tree.test.tsx.snap
+++ b/x-pack/plugins/code/public/components/symbol_tree/__test__/__snapshots__/symbol_tree.test.tsx.snap
@@ -471,6 +471,106 @@ exports[`render symbol tree correctly 1`] = `
                       </div>
                     </div>
                   </div>
+                  <div
+                    className="euiSideNavItem euiSideNavItem--branch"
+                  >
+                    <div
+                      className="euiFlexGroup euiFlexGroup--alignItemsCenter euiFlexGroup--directionRow euiFlexGroup--responsive"
+                    >
+                      <div
+                        className="sc-bwzfXH jYpsNE"
+                      >
+                        <div
+                          className="euiFlexItem euiFlexItem--flexGrow1"
+                        >
+                          <a
+                            className="code-link"
+                            href="/github.com/elastic/kibana/blob/master/packages/elastic-datemath/src/index.d.ts!L21:0?tab=structure"
+                            onClick={[Function]}
+                          >
+                            <div
+                              className="euiFlexGroup euiFlexGroup--alignItemsCenter euiFlexGroup--directionRow euiFlexGroup--responsive code-structure-node"
+                            >
+                              <div
+                                className="euiToken euiToken--tokenTint04 euiToken--circle euiToken--small sc-htpNat hDSXcY"
+                              >
+                                <svg
+                                  className="euiIcon euiIcon--medium"
+                                  focusable="false"
+                                  height="16"
+                                  style={null}
+                                  viewBox="0 0 16 16"
+                                  width="16"
+                                  xmlns="http://www.w3.org/2000/svg"
+                                >
+                                  <path
+                                    d="M6.649 4.667l1.326 4.7h.05l1.326-4.7h1.982l-2.134 6.666H6.801L4.667 4.667z"
+                                    fillRule="evenodd"
+                                  />
+                                </svg>
+                              </div>
+                              <div
+                                className="euiText euiText--small"
+                                data-test-subj="codeStructureTreeNode-Unit"
+                              >
+                                Unit
+                              </div>
+                            </div>
+                          </a>
+                        </div>
+                      </div>
+                    </div>
+                  </div>
+                  <div
+                    className="euiSideNavItem euiSideNavItem--branch"
+                  >
+                    <div
+                      className="euiFlexGroup euiFlexGroup--alignItemsCenter euiFlexGroup--directionRow euiFlexGroup--responsive"
+                    >
+                      <div
+                        className="sc-bwzfXH jYpsNE"
+                      >
+                        <div
+                          className="euiFlexItem euiFlexItem--flexGrow1"
+                        >
+                          <a
+                            className="code-link"
+                            href="/github.com/elastic/kibana/blob/master/packages/elastic-datemath/src/index.d.ts!L23:14?tab=structure"
+                            onClick={[Function]}
+                          >
+                            <div
+                              className="euiFlexGroup euiFlexGroup--alignItemsCenter euiFlexGroup--directionRow euiFlexGroup--responsive code-structure-node"
+                            >
+                              <div
+                                className="euiToken euiToken--tokenTint07 euiToken--circle euiToken--small sc-htpNat hDSXcY"
+                              >
+                                <svg
+                                  className="euiIcon euiIcon--medium"
+                                  focusable="false"
+                                  height="16"
+                                  style={null}
+                                  viewBox="0 0 16 16"
+                                  width="16"
+                                  xmlns="http://www.w3.org/2000/svg"
+                                >
+                                  <path
+                                    d="M9.414 3.757l2.829 2.829a2 2 0 0 1 0 2.828l-2.829 2.829a2 2 0 0 1-2.828 0L3.757 9.414a2 2 0 0 1 0-2.828l2.829-2.829a2 2 0 0 1 2.828 0zm-1.747 2.91a1 1 0 0 0-1 1v.666a1 1 0 0 0 1 1h.666a1 1 0 0 0 1-1v-.666a1 1 0 0 0-1-1h-.666z"
+                                    fillRule="evenodd"
+                                  />
+                                </svg>
+                              </div>
+                              <div
+                                className="euiText euiText--small"
+                                data-test-subj="codeStructureTreeNode-datemath"
+                              >
+                                datemath
+                              </div>
+                            </div>
+                          </a>
+                        </div>
+                      </div>
+                    </div>
+                  </div>
                   <div
                     className="euiSideNavItem euiSideNavItem--branch euiSideNavItem--hasChildItems"
                   >
diff --git a/x-pack/plugins/code/public/components/symbol_tree/__test__/props.ts b/x-pack/plugins/code/public/components/symbol_tree/__test__/props.ts
index 5ab617e9b658c..523a4708b0ac7 100644
--- a/x-pack/plugins/code/public/components/symbol_tree/__test__/props.ts
+++ b/x-pack/plugins/code/public/components/symbol_tree/__test__/props.ts
@@ -112,6 +112,26 @@ export const props: { structureTree: SymbolWithMembers[] } = {
                 },
               ],
             },
+            {
+              name: 'Unit',
+              kind: SymbolKind.Variable,
+              location: {
+                uri:
+                  'git://github.com/elastic/kibana/blob/master/packages/elastic-datemath/src/index.d.ts',
+                range: { start: { line: 20, character: 0 }, end: { line: 20, character: 66 } },
+              },
+              path: 'Unit',
+            },
+            {
+              name: 'datemath',
+              kind: SymbolKind.Constant,
+              location: {
+                uri:
+                  'git://github.com/elastic/kibana/blob/master/packages/elastic-datemath/src/index.d.ts',
+                range: { start: { line: 22, character: 14 }, end: { line: 47, character: 1 } },
+              },
+              path: 'datemath',
+            },
           ],
         },
       ],
diff --git a/x-pack/plugins/code/public/reducers/symbol.ts b/x-pack/plugins/code/public/reducers/symbol.ts
index b02a03a2486ac..177d80d0db134 100644
--- a/x-pack/plugins/code/public/reducers/symbol.ts
+++ b/x-pack/plugins/code/public/reducers/symbol.ts
@@ -58,8 +58,11 @@ const generateStructureTree: (symbols: SymbolInformation[]) => any = symbols =>
 
   function findContainer(
     tree: SymbolWithMembers[],
-    containerName: string
+    containerName?: string
   ): SymbolInformation | undefined {
+    if (containerName === undefined) {
+      return undefined;
+    }
     const regex = new RegExp(`^${containerName}[<(]?.*[>)]?$`);
     const result = tree.find((s: SymbolInformation) => {
       return regex.test(s.name);
@@ -93,7 +96,7 @@ const generateStructureTree: (symbols: SymbolInformation[]) => any = symbols =>
           (sy: SymbolInformation) => sy.name === SPECIAL_SYMBOL_NAME
         );
       } else {
-        container = findContainer(structureTree, s.containerName || '');
+        container = findContainer(structureTree, s.containerName);
       }
       if (container) {
         if (!container.path) {