3 files changed, 9 insertions, 3 deletions
diff --git a/packages/sol-cov/src/collect_coverage_entries.ts b/packages/sol-cov/src/collect_coverage_entries.ts
index b145f044e..3fc85008c 100644
--- a/packages/sol-cov/src/collect_coverage_entries.ts
+++ b/packages/sol-cov/src/collect_coverage_entries.ts
@@ -10,7 +10,7 @@ const coverageEntriesBySourceHash: { [sourceHash: string]: CoverageEntriesDescri
 
 export const collectCoverageEntries = (contractSource: string) => {
     const sourceHash = ethUtil.sha3(contractSource).toString('hex');
-    if (_.isUndefined(coverageEntriesBySourceHash[sourceHash])) {
+    if (_.isUndefined(coverageEntriesBySourceHash[sourceHash]) && !_.isUndefined(contractSource)) {
         const ast = parser.parse(contractSource, { range: true });
         const locationByOffset = getLocationByOffset(contractSource);
         const visitor = new ASTVisitor(locationByOffset);
diff --git a/packages/sol-cov/src/coverage_subprovider.ts b/packages/sol-cov/src/coverage_subprovider.ts
index 065a48434..45843bc96 100644
--- a/packages/sol-cov/src/coverage_subprovider.ts
+++ b/packages/sol-cov/src/coverage_subprovider.ts
@@ -66,6 +66,12 @@ export const coverageHandler: SingleFileSubtraceHandler = (
 ): Coverage => {
     const absoluteFileName = contractData.sources[fileIndex];
     const coverageEntriesDescription = collectCoverageEntries(contractData.sourceCodes[fileIndex]);
+
+    // if the source wasn't provided for the fileIndex, we can't cover the file
+    if (_.isUndefined(coverageEntriesDescription)) {
+        return {};
+    }
+
     let sourceRanges = _.map(subtrace, structLog => pcToSourceRange[structLog.pc]);
     sourceRanges = _.compact(sourceRanges); // Some PC's don't map to a source range and we just ignore them.
     // By default lodash does a shallow object comparasion. We JSON.stringify them and compare as strings.
diff --git a/packages/sol-cov/src/source_maps.ts b/packages/sol-cov/src/source_maps.ts
index f9503e16c..90b21dda1 100644
--- a/packages/sol-cov/src/source_maps.ts
+++ b/packages/sol-cov/src/source_maps.ts
@@ -36,7 +36,7 @@ export function parseSourceMap(
 ): { [programCounter: number]: SourceRange } {
     const bytecode = Uint8Array.from(Buffer.from(bytecodeHex, 'hex'));
     const pcToInstructionIndex: { [programCounter: number]: number } = getPcToInstructionIndexMapping(bytecode);
-    const locationByOffsetByFileIndex = _.map(sourceCodes, getLocationByOffset);
+    const locationByOffsetByFileIndex = _.map(sourceCodes, s => (_.isUndefined(s) ? {} : getLocationByOffset(s)));
     const entries = srcMap.split(';');
     let lastParsedEntry: SourceLocation = {} as any;
     const instructionIndexToSourceRange: { [instructionIndex: number]: SourceRange } = {};
@@ -56,7 +56,7 @@ export function parseSourceMap(
             length,
             fileIndex,
         };
-        if (parsedEntry.fileIndex !== -1) {
+        if (parsedEntry.fileIndex !== -1 && !_.isUndefined(locationByOffsetByFileIndex[parsedEntry.fileIndex])) {
             const sourceRange = {
                 location: {
                     start: locationByOffsetByFileIndex[parsedEntry.fileIndex][parsedEntry.offset],